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Periodic Classification of Elements NCERT exemplar Class 10 Science solutions chapter 5 discusses the periodic table and its historical development. This chapter describes how the periodic table is classified. Our experienced subject matter experts have carefully prepared the NCERT exemplar Class 10 Science chapter 5 solutions to present exact and relevant responses to the students while practicing NCERT Class 10 Science questions. These NCERT exemplar Class 10 Science chapter 5 solutions develop a better understanding of the periodic classification of elements they are comprehensive in nature. The NCERT exemplar Class 10 Science solutions chapter 5 covers all the aspects within the CBSE syllabus for Class 10 chapter 5.
Also read - NCERT Solutions for Class 10
Question:1
Upto which element, the Law of Octaves was found to be applicable
(a) Oxygen
(b) Calcium
(c) Cobalt
(d) Potassium
Ans. (b)
Newlands octave rule was applicable only to lighter elements up to 40u therefore Newland Octave’s rules are applicable only up to calcium. After calcium, each eighth element doesn't have properties like that of the first.
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Question:2
According to Mendeleev's Periodic Law, the elements were arranged in the periodic table in the order of:
(a) increasing atomic number
(b) decreasing atomic number
(c) increasing atomic masses
(d) decreasing atomic masses
Ans.(c)
Mendeleev realized that the chemical and physical properties of elements were related to their atomic mass in a 'periodic'
way, and arranged them so that groups of elements with similar properties fell into vertical columns in his table.
So, according to Mendeleev’s periodic table elements are arranged according to atomic mass.
Question:3
In Mendeleev ’s Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later
(a) Germanium
(b) Chlorine
(c) Oxygen
(d) Silicon
Ans (a)
Chlorine, oxygen and silicon were already included in Mendeleev's periodic table.
Eka-Silicon -- Germanium
Eka-aluminum -- Gallium
were the elements that are left by Mendeleev in his periodic table.
Question:4
Which of the following statement (s) about the Modern Periodic Table are incorrect
(i) The elements in the Modern Periodic Table are arranged on the basis of their decreasing atomic number
(ii) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic masses
(iii) Isotopes are placed in adjoining group (s) in the Periodic Table
(iv) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic number
(a) (i) only
(b) (i), (ii) and (iii)
(c) (i), (ii) and (iv)
(d) (iv) only
Ans.(b)
(i) The elements in the Modern Periodic Table are arranged on the basis of their decreasing atomic number – Incorrect as the elements in periodic table are arranged according to increasing atomic number.
(ii) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic masses – Incorrect as atomic mass was the criteria for Mendeleev’s periodic table.
(iii) Isotopes are placed in adjoining group (s) in the Periodic Table – Incorrect as isotopes have same electronic configuration and thus they are placed in the same group.
(iv) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic number – Correct.
Hence option (b) is correct.
Question:5
Which of the following statements about the Modern Periodic Table is correct:
(a) It has 18 horizontal rows known as Periods
(b) It has 7 vertical columns known as Periods
(c) It has 18 vertical columns known as Groups
(d) It has 7 horizontal rows known as Groups
Ans (c)
According to Modern Periodic Table:
18 – Vertical Columns – known as Groups
7 - Horizontal Rows – known as Periods
Hence option (c) is correct.
Question:6
Which of the given elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively belong to the same period?
(a) A, B, C
(b) B, C, D
(c) A, D, E
(d) B, D, E
Ans(b)
First period – 2 elements – Atomic number 1-2
Second period – 8 elements – Atomic number 3-10
Third period – 8 elements – Atomic number 11-18
Fourth period – 16 elements – Atomic number 19-36
So, 2nd Period has elements with atomic number 3 to 10
Hence option (b) is correct.
Question:7
The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belong to the same group?
(a) A and B
(b) B and D
(c) A and C
(d) D and E
Ans (c)
Electronic configuration of A (atomic number 9): 2,7
Electronic configuration of B (atomic number 11): 2,8,1
Electronic configuration of C (atomic number 17): 2,8,7
Electronic configuration of D (atomic number 12): 2,8,2
Electronic configuration of E (atomic number 13): 2,8,3
Elements having same number of electrons in the outer most shell belong to same group therefore A and C belong to same group
Hence option (c) is correct.
Question:8
Where would you locate the element with electronic configuration 2,8 in the Modern Periodic Table?
(a) Group 8
(b) Group 2
(c) Group 18
(d) Group 10
Ans (c)
Electronic configuration 2, 8 means a complete octet. So the element is a noble gas.
Element which has 8 electrons in the outer most shell belong to 18th group.
Hence option (c) is correct.
Question:9
An element which is an essential constituent of all organic compounds belongs to
(a) group 1
(b) group 14
(c) group 15
(d) group 16
Ans (b)
Carbon is the essential constituent of all organic compounds.
Carbon belongs to the 14th group.
Hence option (b) is correct.
Question:10
Which of the following is the outermost shell for elements of period 2?
(a) K shell
(b) L shell
(c) M shell
(d) N shell
Ans (b)
Second period means elements having two valence shells
So, elements of period 2 has L as the outer most shell.
Hence option (b) is correct.
Question:11
Which one of the following elements exhibit maximum number of valence electrons?
(a) Na
(b) Al
(c) Si
(d) P
Ans (d)
Na – Group 1 – 1 valence electron
Al – Group 13 – 3 valence electrons
Si – Group 14 – 4 valence electrons
P – Group 15 – 5 valence electrons
Hence option (d) is correct.
Question:12
Which of the following gives the correct increasing order of the atomic radii of O, F and N ?
(a) O, F, N
(b) N, F, O
(c) O, N, F
(d) F, O, N
Ans (d)
Along a period from left to right - Number of protons increases and valence shell remains the same.
Hence radius of the atom decreases.
Correct increasing order of the atomic radii of O, F and N:
F , O , N
Hence option (d) is correct.
Question:13
Which among the following elements has the largest atomic radii?
(a) Na
(b) Mg
(c) K
(d) Ca
Ans (c)
Atomic radius increases when we move from top to bottom along a group and it decreases when it moves from left to right along a period.
So Potassium has the highest radius as it is left on the periodic table and also at the bottom of a group compared to all the elements in the same group.
Simultaneously it belongs to alkali metals which are highly electropositive and gain inert gas configuration by losing an electron.
Hence option (c) is correct
Question:14
Which of the following elements would lose an electron easily?
(a) Mg
(b) Na
(c) K
(d) Ca
Ans (c)
Atomic radius increases when we move from top to bottom along a group and it decreases when it moves from left to right along a period.
So Potassium has the highest radius as it is left on the periodic table and also at the bottom of a group compared to all the elements in the same group.
Simultaneously it belongs to alkali metals which are highly electropositive and gain inert gas configuration by losing an electron.
Hence option (c) is correct.
Question:15
Which of the following elements does not lose an electron easily?
(a) Na
(b) F
(c) Mg
(d) Al
Ans (b)
Fluorine (F) has atomic number 9
Electronic configuration: 2, 7.
Fluorine has a tendency to gain one electron to form a stable configuration with 8 electrons in the outermost shell.
Fluorine is the most electronegative element in the whole periodic table. So, it does not lose the electron that easily.
Hence option (b) is correct.
Question:16
Which of the following are the characteristics of isotopes of an element?
(i) Isotopes of an element have same atomic masses
(ii) Isotopes of an element have same atomic number
(iii) Isotopes of an element show same physical properties
(iv) Isotopes of an element show same chemical properties
(a) (i), (iii) and (iv) (b) (ii), (iii) and (iv)
(c) (ii) and (iii) (d) (ii) and (iv)
Ans (d)
Isotopes of an element are atoms with same atomic number and different atomic mass. Hence they have similar chemical properties as they have same electronic configuration and they have different physical properties due to different mass.
Hence option (d) is correct.
Question:17
Arrange the following elements in the order of their decreasing metallic character Na, Si, Cl, Mg, Al
(a) Cl > Si >Al > Mg >Na
(b) Na >Mg >Al >Si > Cl
(c) Na > Al > Mg > Cl > Si
(d) Al > Na> Si > Ca> Mg
Ans (b)
Metallic character decreases when we move from left to right in a period
Na > Mg > Al > Si > Cl
Hence option (b) is correct.
Question:18
Arrange the following elements in the order of their increasing non-metallic character Li, O, C, Be, F
(a) F < O < C < Be < Li
(b) Li < Be < C < O< F
(c) F < O < C < Be < Li
(d) F < O < Be < C < Li
Ans (b)
Metallic character decreases when we move from left to right in a period
Li Be C O F
Hence option (b) is correct.
Question:19
What type of oxide would Eka– aluminium form?
(a) EO3
(b) E3 O2
(c) E2 O3
(d) EO
Ans (c)
Eka-aluminum is the element Gallium
Gallium has a valency of 3. Hence it forms an oxide having molecular formula E2O3.
Hence option (c) is correct.
Question:20
Three elements B, Si, and Ge are
(a) metals
(b) non-metals
(c) metalloids
(d) metal, non-metal, and metalloid respectively
Ans (c)
Boron is a chemical element with the symbol B and atomic number 5. It is a metalloid.
Silicon is a chemical element with the symbol Si and atomic number 14. It is a metalloid.
Germanium is a chemical element with the symbol Ge and atomic number 32. It is a metalloid.
Hence, Boron, Silicon, and Germanium are metalloids which are placed diagonally in periodic table.
Hence option (c) is correct.
Question:21
Which of the following elements will form an acidic oxide?
(a) An element with atomic number 7
(b) An element with atomic number 3
(c) An element with atomic number 12
(d) An element with atomic number 19
Ans (a)
Non Metals form an acidic oxide and Metal forms basic oxides
Element with atomic number 7: Nitrogen - Non-metal
Element with atomic number 3: Lithium - Metal
Element with atomic number 12: Magnesium - Metal
Element with atomic number 19: Potassium - Metal
So element with atomic number 7 forms acidic oxide.
Hence option (a) is correct.
Question:22
The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?
(a) Metal
(b) Metalloid
(c) Non-metal
(d) Left-hand side element
Ans (b)
Element with atomic number 14 – Silicon (Si)
It is hard and brittle.
Silicon forms acidic oxides such as silicon dioxide which is weakly acidic.
Non-metals need to gain electrons to become stable. When non-metals react with halogens, they can share electrons and form covalent bonds.
Si has a tendency to react with halogens and form covalent bonds.
Hence, it is a metalloid (shows characteristics of both metals and non metals)
Hence option (b) is correct.
Question:23
Which one of the following depict the correct representation of atomic radius(r) of an atom?
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)
Ans (b)
Atomic radius is the distance between the centre of the nucleus to the outer most shell which contains electrons.
We can see that in figure (ii) and (iii), correct representation is shown.
Hence option (b) is correct.
Question:24
Which one of the following does not increase while moving down the group of the periodic table?
(a) Atomic radius
(b) Metallic character
(c) Valence
(d) Number of shells in an element
Ans (c)
Atomic radius increases down a group
Metallic character increases down a group
The number of electrons in the outer most shell are same in a group hence valence electrons and valency of all the elements in the group remains the same when we move from top to bottom.
Number of shells in an element increases down a group
Hence option (c) is correct.
Question:25
On moving from left to right in a period in the periodic table, the size of the atom.
(a) increases
(b) decreases
(c) does not change appreciably
(d) first decreases and then increases
Ans (b)
When move from left to right in a period the atomic radius decreases as the number of electrons are increasing in the outer most shell
which increases the nuclear forces among them.
Hence option (b) is correct.
Question:26
Which of the following set of elements is written in order of their increasing metallic character?
(a) Be Mg Ca
(b) Na Li K
(c) Mg Al Si
(d) C O N
Ans (a)
When we move from top to bottom in group the metallic nature increases as the atomic size increases due to increase in the number of shells.
Hence metallic character:
Ca Mg Be
K Na Li
Metallic character goes on decreasing while going from left to right in a period.
Hence metallic character:
Mg Al Si
C N O
Hence option (a) is correct.
Question:27
Such an arrangement of elements is called triad, as in Dobereiner’s Triads.
Doberenier’s Triads: It is the arrangement of elements as a set containing 3 elements where mass of
middle element is equal or close to the average of other two elements.
For example,
Lithium (Atomic mass 7), Sodium (Atomic mass 23) and Potassium (Atomic mass 39)
Average atomic mass of Li and K =
Question:28
(a) SET 1 – F, Cl
SET 2 – Na, K
(b)The law of octaves states that every eighth element has similar properties when the elements are arranged in the increasing order of their atomic masses.
Based on Newlands octaves rule the above elements can be arranged as Follows:
F Na Mg Al Si P S Cl K Ar
Question:29
Doberenier’s Triads: It is the arrangement of elements as a set containing 3 elements where mass of middle element is equal or close to the average of other two elements.
(a)(23) ; Si(28) ; Cl(35)
Atomic Mass of Si=
= 29
Silicon mass is close to the average of Sodium and chlorine but the above three elements are not dobereiner’s traits as the properties of the elements don’t match.
(b)Be(9) ; Mg(24) ; Ca(40)
Atomic mass of Mg=
Magnesium mass is close to the average of Beryllium and calcium and all the three
elements have common properties therefore the above three elements are a dobereiner’s triads.
Question:30
In Mendeleev ’s Periodic Table the elements were arranged in the increasing order of their atomic masses. But cobalt with atomic mass of 58.93 amu was placed before nickel having an atomic mass of 58.71 amu because
a)The properties of cobalt are similar to rhodium and iridium
b)The properties of nickel are similar to palladium and platinum
And in order to have the elements with similar properties under one group cobalt is placed before nickel even if its mass is greater than that of nickel.
Question:31
“Hydrogen occupies a unique position in Modern Periodic Table”. Justify the statement.
Answer:
Hydrogen is placed separately in periodic table because:
a) Considering the properties, it is similar to alkali metals
b) Based on electronic configuration it is one electron short for inert gas configuration which is similar to halogens
c) Some of the properties do not resemble with alkali metals like the nature of oxides. Hydrogen oxide (H2O) is neutral but alkali
metal oxides are basic and halogen oxides are acidic.
Question:32
Eka-Silicon means Germanium (Ge) which belongs to group 4 (carbon group) whose valency is 4
So chloride of germanium is : GeCl4
Eka-aluminum means Gallium (Ga) which belongs to group 3 (Boron group) whose valency is 3
So chloride of Gallium is : GaCl3
Question:33
i) Element A has 3 electrons in the outer most shell therefore its valency is 3. So element A can be one of the following: B, Al, Ga, In , Tl
ii) Element B has 4 electrons in the outer most shell therefore its valency is 4. So element B can be one of the following: C, Si, Ge, Sn, Pb
iii) Element C has 2 electrons in the outer most shell therefore its valency is 2. So element C can be one of the following: Be, Mg, Ca, Sr, Ba, Ra
Question:34
Elements belonging to group 14 will have an electronic configuration: 2 8 4
So, it has 4 electrons in the outer most shell therefore its valency is 4
Thus, the chloride of element X will be XCl4
Question:35
Species X:
K L M
2 8 2
Which has three shells.
Species Y:
K L
2 8
Which has two shells.
Since element X has 3 shells and Y has only 2 shells, we can make a conclusion the element X has larger radius compared to Y.
Question:36
(a) Li, Be, F, N
All the elements above belong to same period (2nd Period) and when we move from left to right in a period, the atomic radius decreases.
FNBeLi
(b) Cl, At, Br, IAll the elements above belong to same group (17th Group) and
when we move from top to bottom in a group the atomic radius increases.
Cl Br I At
Question:37
Identify and name the metals out of the following elements whose electronic configurations are given below.
(a) 2, 8, 2
(b) 2, 8, 1
(c) 2, 8, 7
(d) 2, 1
Answer:
Electronic Configuration | Valence electrons | Metal / Non-Metal | Atomic Number | Name of the elements |
2,8,2 | 2 | Metal | 2+8+2=12 | Magnesium |
2,8,1 | 1 | Metal | 2+8+1=11 | Sodium |
2,8,7 | 7 | Non-Metal | 2+8+7=17 | Chlorine |
2,1 | 1 | Metal | 2+1=3 | Lithium |
Question:38
Electronic configuration of A(21) : 2 8 8 1
Electronic Configuration of B(17): 2 8 7
A is an electropositive element so it tends to lose an electron to attain noble gas configuration on the other hand B is an electronegative element
which takes an electron and gains noble gas configuration.
Based on atomic number A is potassium and B is Chlorine.
Electron dot structure:
Ionic bond will be formed.
Question:39
Group No : 1 2 13 14
3rd Period : Mg
4th Period : K Ca Ga Ge
When we move from left to right in a period the metallic nature decreases and all the nonmetals are present in p-block.
On the other hand, when me move from top to bottom in a group the metallic character increases. So,
taking all these trends into consideration:
GeGaMgCaK
Question:40
a) Sodium (Na) and Potassium(K) belong to alkali metals which are highly reactive due to their electro positive nature and these elements are so reactive that these are kept in kerosene so that they won’t react with oxygen or moisture in air.
b) Limestone is CaCO3: Calcium is the only metal in its molecule. Therefore, calcium is the most important metal in limestone.
c) Mercury is the only metal which exists as liquid in room temperature.
Order of reactivity Mercury (Hg) Calcium (ca) sodium (Na)
Question:41
a) Sodium (Na) and Potassium (K) belong to alkali metals which are highly reactive due to their electropositive nature and these elements are so reactive that these are kept in kerosene so that they won’t react with oxygen or moisture in air. Sodium is found in group 1 period 3 and potassium is found in group 1 period 4.
b) Phosphorous shows variable valency of 3 and 5. It is stored under water as it is highly
reactive when it comes in contact with air. Phosphorous is placed in group 15 period 3.
c) Carbon is tetravalent and it is the basis for all the organic compounds in nature. Carbon is placed in group 14 and period 2.
d) Helium is the inert gas with atomic number 2 and it is the lightest inert gas. Helium is placed in group 18 and period 1.
e) Anodizing is the process of making a thin layer of Al2O3 on other elements to protect from corrosion. Aluminum is the main metal in that thin layer, it is placed in group 13 and period 3.
Question:42
a) Element is in 2nd Group and 3rd Period that means it belongs to Alkali Earth Metals and it is Magnesium (Mg).
b) Atomic Number of Magnesium is 12 whose electronic configuration is:
K L M
2 8 2
c) When Magnesium is burnt in the presence in air it will form Magnesium Oxide.
d) When Magnesium Oxide is dissolved in water it will form Magnesium Hydroxide.
e) Electronic Configuration of Magnesium: 2 8 2
Electronic Configuration of Oxygen: 2 6
Electron Dot Structure:
Question:43
a) Element X has atomic number 17 (Chlorine) and its electronic configuration is 2 8 7
It has 7 valence electrons, so it belongs to group 17 and it has 3 shells which means it belongs to 3rd Period.
Element Y has atomic number 20 (Calcium) and its electronic configuration is 2 8 8 2
It has 2 valence electrons and it belongs to group 2 and it has 4 shells which means it belongs to 4th Period.
b) As element X has 7 electrons in the outer most shell it is short of one
electron for inert gas configuration. So, X will prefer accepting an electron hence it is a Non-Metal. Whereas element Y has 2 electrons in the outermost shell which means this element prefers to lose electrons and reach inert gas configuration. So, element Y is going to be a metal.
c) Since Y is a metal, and all the metallic oxides are basic in nature. Oxygen being a non-metal, the bonding between them is going to be Ionic in nature (Electropositive (Metals) and electronegative (Non-metals) elements will form Ionic Bond).
d) Electronic Configuration of Calcium: 2 8 8 2
Electronic Configuration of Chlorine: 2 8 7
Electron Dot Structure of Calcium Chloride CaCl2
Question:44
Group Number is Electrons in the outer most shell plus 10 as long as the electrons in the outermost shell is greater than 2.
Period Number is the number of shells that are filled by electrons.
Valency is the least number of electrons an element loses or gains to have an inert gas configuration
Atomic Number | (d) Electronic Configuration | (b) Group Number | (c) Period Number | (e) Valency | (a) Element |
10 | 2,8 | (8+10=18) | 2 | 0 | Neon |
20 | 2,8,8,2 | 2 | 4 | 2 | Calcium |
7 | 2,5 | 15 | 2 | 3 | Nitrogen |
14 | 2,8,4 | 14 | 3 | 4 | Silicon |
Question:45
Across
1) Element with atomic number 12: Magnesium
3) Metal used in making cans and member of Group 14: Tin
4) A lustrous non-metal which has 7 electrons in its outermost shell: Iodine
Down
2) Highly reactive and soft metal which imparts yellow colour when subjected to flame and is kept in kerosene: Sodium
5) The first element of second Period: Lithium
6) An element which is used in making fluorescent bulbs and is second member of Group 18 in the Modern Periodic Table: Neon
7) A radioactive element which is the last member of halogen family: Astatine
8) Metal which is an important constituent of steel and forms rust when exposed to moist air: Iron
9) The first metalloid in Modern Periodic Table whose fibres are used in making bullet-proof vests: Boron
Question:46
Answer:
a)H, He, Li, Be, B, C, N, O, F, Ne, Na, Mg, Al, Si, P, S, Cl, Ar, K, Ca
b)
1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
H | He | ||||||
Li | Be | B | C | N | O | F | Ne |
Na | Mg | Al | Si | P | s | Cl | Ar |
K | Ca |
Question:47
a)
Eka-Silicon---------- Germanium
Eka-aluminum---------- Gallium
b)
Germanium is in group 14, Period 4
Gallium is in group 13, Period 4
c)
Gallium is a Metal
Germanium is Metalloid
d)
Ga lies in group 13 which means it has 3 valence electrons.
Ge lies in group 14 which means it has 4 valence electrons.
Question:48
Atomic Number | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
Name | Lithium | Beryllium | Boron | Carbon | Nitrogen | Oxygen | Fluorine |
Symbol | Li | Be | B | C | N | O | F |
a) Lithium (atomic number 3) is the most electropositive element in 2nd Period as it is the left most element in the period
d) Fluorine (atomic number 9) is the most electronegative element in 2nd Period as it is the right most element in the period
c) Element with smaller atomic size is fluorine (atomic number 9) as the atomic size decreases as we move from left to right in a period
d) Boron (atomic number 5) is the metalloid in 2nd Period.
e) Carbon (atomic number 6) has the maximum valency of 4.
Question:49
(a) X is Sulphur
Atomic number of Sulphur = 16
(b) Electronic configuration of Sulphur = 2, 8, 6
(c)
(d) Oxides of Sulphur (SO2, SO3) are acidic in nature.
(e) Sulphur belongs to Group 16, Period 3 in the Modern Periodic Table.
Question:50
(a) X is nitrogen (atomic number 7)
Electronic configuration: 2, 5
Valence electrons: 5
(b)
(c) Ammonia is NH3
N atom has the following Lewis structure:
It has three unpaired electrons, each of which can make a covalent bond by sharing electrons with an H atom.
Electron dot structure for ammonia:
It forms a covalent bond.
Question:51
The noble gases could have been placed in a separate group without disturbing the group as they are found in atmosphere with very little concentrations and have inert properties.
When Mendeleev gave periodic table, none of the noble gases were discovered. When they were later discovered, they were placed in a separate group called as Zero group.
Question:52
When Mendeleev was working with the periodic table, only 63 elements were known to mankind. He focused on the masses of the elements as well as the nature of the compounds formed when these reacted with oxygen and hydrogen. He grouped the elements which had similar oxide and hydride formations under same group and arranged them according to their atomic masses.
Elements with similar properties were arranged in a group.
Mendeleev observed that elements were automatically arranged in the order of increasing atomic masses
The chapter on Periodic Classification of Elements in NCERT exemplar Class 10 Science solutions chapter 5 covers the below-mentioned topics:
NCERT Class 10 Science Exemplar Solutions for Other Chapters:
These Class 10 Science NCERT exemplar chapter 5 solutions provide an understanding of periodic table and how it is classified. We will also learn that Mendeleev had left some spaces for those matters which can be discovered later. These elaborate solutions can be used by the students to understand and hone the concepts of Periodic classification of elements. The Class 10 Science NCERT exemplar solutions chapter 5 Periodic classification of elements are sufficient to develop a strong base in order to solve problems given in other books such as Chemistry question bank, NCERT Class 10 Science, S. Chand by Manjit Kaur and Lakhmir Singh, et cetera.
It is highly suggested to explore the NCERT exemplar Class 10 Science solutions chapter 5 pdf download feature to keep the solutions handy when attempting the problems of NCERT exemplar Class 10 Science chapter 5 in offline mode.
Check NCERT Solutions for questions given in the book
Chapter No. | Chapter Name |
Chapter 1 | Chemical Reactions and Equations |
Chapter 2 | Acids, Bases, and Salts |
Chapter 3 | Metals and Non-metals |
Chapter 4 | Carbon and its Compounds |
Chapter 5 | Periodic Classification of Elements |
Chapter 6 | Life Processes |
Chapter 7 | Control and Coordination |
Chapter 8 | How do Organisms Reproduce? |
Chapter 9 | Heredity and Evolution |
Chapter 10 | Light Reflection and Refraction |
Chapter 11 | The Human Eye and The Colorful World |
Chapter 12 | Electricity |
Chapter 13 | Magnetic Effects of Electric Current |
Chapter 14 | Sources of Energy |
Chapter 15 | Our Environment |
Chapter 16 | Sustainable Management of Natural Resources |
Must check NCERT Solution Subject Wise
Read more NCERT Notes Subject Wise
A1. In the modern periodic table, elements are arranged in increasing order of atomic number.
A2. Shells are those orbits in which electrons revolve around the nucleus. Every orbit has limitation on number of electrons it can have. These orbits or shells are named as KLMN shells
A3. The radius of the last orbit where electron can exist in any substance is called atomic radius. This radius is very large in comparison with nuclear radius.
A4. NCERT Exemplar class 10 science solutions chapter 5 equip the student with a multidimensional approach to the problems and understand the concept of Periodic classifications of elements.
A5. The chapter of Periodic classifications of elements is important for Board examinations as it holds around 5-7% weightage of the whole paper.
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The dates of the CBSE Class 10th and Class 12 exams are February 15–March 13, 2024 and February 15–April 2, 2024, respectively. You may obtain the CBSE exam date sheet 2024 PDF from the official CBSE website, cbse.gov.in.
To get the complete datesheet, you can visit our website by clicking on the link given below.
https://school.careers360.com/boards/cbse/cbse-date-sheet
Thank you
Hope this information helps you.
Hello aspirant,
The paper of class 7th is not issued by respective boards so I can not find it on the board's website. You should definitely try to search for it from the website of your school and can also take advise of your seniors for the same.
You don't need to worry. The class 7th paper will be simple and made by your own school teachers.
Thank you
Hope it helps you.
The eligibility age criteria for class 10th CBSE is 14 years of age. Since your son will be 15 years of age in 2024, he will be eligible to give the exam.
That totally depends on what you are aiming for. The replacement of marks of additional subjects and the main subject is not like you will get the marks of IT on your Hindi section. It runs like when you calculate your total percentage you have got, you can replace your lowest marks of the main subjects from the marks of the additional subject since CBSE schools goes for the best five marks for the calculation of final percentage of the students.
However, for the admission procedures in different schools after 10th, it depends on the schools to consider the percentage of main five subjects or the best five subjects to admit the student in their schools.
Database professionals use software to store and organise data such as financial information, and customer shipping records. Individuals who opt for a career as data administrators ensure that data is available for users and secured from unauthorised sales. DB administrators may work in various types of industries. It may involve computer systems design, service firms, insurance companies, banks and hospitals.
The field of biomedical engineering opens up a universe of expert chances. An Individual in the biomedical engineering career path work in the field of engineering as well as medicine, in order to find out solutions to common problems of the two fields. The biomedical engineering job opportunities are to collaborate with doctors and researchers to develop medical systems, equipment, or devices that can solve clinical problems. Here we will be discussing jobs after biomedical engineering, how to get a job in biomedical engineering, biomedical engineering scope, and salary.
A career as ethical hacker involves various challenges and provides lucrative opportunities in the digital era where every giant business and startup owns its cyberspace on the world wide web. Individuals in the ethical hacker career path try to find the vulnerabilities in the cyber system to get its authority. If he or she succeeds in it then he or she gets its illegal authority. Individuals in the ethical hacker career path then steal information or delete the file that could affect the business, functioning, or services of the organization.
GIS officer work on various GIS software to conduct a study and gather spatial and non-spatial information. GIS experts update the GIS data and maintain it. The databases include aerial or satellite imagery, latitudinal and longitudinal coordinates, and manually digitized images of maps. In a career as GIS expert, one is responsible for creating online and mobile maps.
The invention of the database has given fresh breath to the people involved in the data analytics career path. Analysis refers to splitting up a whole into its individual components for individual analysis. Data analysis is a method through which raw data are processed and transformed into information that would be beneficial for user strategic thinking.
Data are collected and examined to respond to questions, evaluate hypotheses or contradict theories. It is a tool for analyzing, transforming, modeling, and arranging data with useful knowledge, to assist in decision-making and methods, encompassing various strategies, and is used in different fields of business, research, and social science.
Individuals who opt for a career as geothermal engineers are the professionals involved in the processing of geothermal energy. The responsibilities of geothermal engineers may vary depending on the workplace location. Those who work in fields design facilities to process and distribute geothermal energy. They oversee the functioning of machinery used in the field.
If you are intrigued by the programming world and are interested in developing communications networks then a career as database architect may be a good option for you. Data architect roles and responsibilities include building design models for data communication networks. Wide Area Networks (WANs), local area networks (LANs), and intranets are included in the database networks. It is expected that database architects will have in-depth knowledge of a company's business to develop a network to fulfil the requirements of the organisation. Stay tuned as we look at the larger picture and give you more information on what is db architecture, why you should pursue database architecture, what to expect from such a degree and what your job opportunities will be after graduation. Here, we will be discussing how to become a data architect. Students can visit NIT Trichy, IIT Kharagpur, JMI New Delhi.
Individuals who opt for a career as a remote sensing technician possess unique personalities. Remote sensing analysts seem to be rational human beings, they are strong, independent, persistent, sincere, realistic and resourceful. Some of them are analytical as well, which means they are intelligent, introspective and inquisitive.
Remote sensing scientists use remote sensing technology to support scientists in fields such as community planning, flight planning or the management of natural resources. Analysing data collected from aircraft, satellites or ground-based platforms using statistical analysis software, image analysis software or Geographic Information Systems (GIS) is a significant part of their work. Do you want to learn how to become remote sensing technician? There's no need to be concerned; we've devised a simple remote sensing technician career path for you. Scroll through the pages and read.
Budget analysis, in a nutshell, entails thoroughly analyzing the details of a financial budget. The budget analysis aims to better understand and manage revenue. Budget analysts assist in the achievement of financial targets, the preservation of profitability, and the pursuit of long-term growth for a business. Budget analysts generally have a bachelor's degree in accounting, finance, economics, or a closely related field. Knowledge of Financial Management is of prime importance in this career.
The invention of the database has given fresh breath to the people involved in the data analytics career path. Analysis refers to splitting up a whole into its individual components for individual analysis. Data analysis is a method through which raw data are processed and transformed into information that would be beneficial for user strategic thinking.
Data are collected and examined to respond to questions, evaluate hypotheses or contradict theories. It is a tool for analyzing, transforming, modeling, and arranging data with useful knowledge, to assist in decision-making and methods, encompassing various strategies, and is used in different fields of business, research, and social science.
An underwriter is a person who assesses and evaluates the risk of insurance in his or her field like mortgage, loan, health policy, investment, and so on and so forth. The underwriter career path does involve risks as analysing the risks means finding out if there is a way for the insurance underwriter jobs to recover the money from its clients. If the risk turns out to be too much for the company then in the future it is an underwriter who will be held accountable for it. Therefore, one must carry out his or her job with a lot of attention and diligence.
A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.
Individuals in the operations manager jobs are responsible for ensuring the efficiency of each department to acquire its optimal goal. They plan the use of resources and distribution of materials. The operations manager's job description includes managing budgets, negotiating contracts, and performing administrative tasks.
Individuals who opt for a career as a stock analyst examine the company's investments makes decisions and keep track of financial securities. The nature of such investments will differ from one business to the next. Individuals in the stock analyst career use data mining to forecast a company's profits and revenues, advise clients on whether to buy or sell, participate in seminars, and discussing financial matters with executives and evaluate annual reports.
A Researcher is a professional who is responsible for collecting data and information by reviewing the literature and conducting experiments and surveys. He or she uses various methodological processes to provide accurate data and information that is utilised by academicians and other industry professionals. Here, we will discuss what is a researcher, the researcher's salary, types of researchers.
Welding Engineer Job Description: A Welding Engineer work involves managing welding projects and supervising welding teams. He or she is responsible for reviewing welding procedures, processes and documentation. A career as Welding Engineer involves conducting failure analyses and causes on welding issues.
A career as Transportation Planner requires technical application of science and technology in engineering, particularly the concepts, equipment and technologies involved in the production of products and services. In fields like land use, infrastructure review, ecological standards and street design, he or she considers issues of health, environment and performance. A Transportation Planner assigns resources for implementing and designing programmes. He or she is responsible for assessing needs, preparing plans and forecasts and compliance with regulations.
Individuals who opt for a career as an environmental engineer are construction professionals who utilise the skills and knowledge of biology, soil science, chemistry and the concept of engineering to design and develop projects that serve as solutions to various environmental problems.
A Safety Manager is a professional responsible for employee’s safety at work. He or she plans, implements and oversees the company’s employee safety. A Safety Manager ensures compliance and adherence to Occupational Health and Safety (OHS) guidelines.
A Conservation Architect is a professional responsible for conserving and restoring buildings or monuments having a historic value. He or she applies techniques to document and stabilise the object’s state without any further damage. A Conservation Architect restores the monuments and heritage buildings to bring them back to their original state.
A Structural Engineer designs buildings, bridges, and other related structures. He or she analyzes the structures and makes sure the structures are strong enough to be used by the people. A career as a Structural Engineer requires working in the construction process. It comes under the civil engineering discipline. A Structure Engineer creates structural models with the help of computer-aided design software.
Highway Engineer Job Description: A Highway Engineer is a civil engineer who specialises in planning and building thousands of miles of roads that support connectivity and allow transportation across the country. He or she ensures that traffic management schemes are effectively planned concerning economic sustainability and successful implementation.
Are you searching for a Field Surveyor Job Description? A Field Surveyor is a professional responsible for conducting field surveys for various places or geographical conditions. He or she collects the required data and information as per the instructions given by senior officials.
Orthotists and Prosthetists are professionals who provide aid to patients with disabilities. They fix them to artificial limbs (prosthetics) and help them to regain stability. There are times when people lose their limbs in an accident. In some other occasions, they are born without a limb or orthopaedic impairment. Orthotists and prosthetists play a crucial role in their lives with fixing them to assistive devices and provide mobility.
A career in pathology in India is filled with several responsibilities as it is a medical branch and affects human lives. The demand for pathologists has been increasing over the past few years as people are getting more aware of different diseases. Not only that, but an increase in population and lifestyle changes have also contributed to the increase in a pathologist’s demand. The pathology careers provide an extremely huge number of opportunities and if you want to be a part of the medical field you can consider being a pathologist. If you want to know more about a career in pathology in India then continue reading this article.
Gynaecology can be defined as the study of the female body. The job outlook for gynaecology is excellent since there is evergreen demand for one because of their responsibility of dealing with not only women’s health but also fertility and pregnancy issues. Although most women prefer to have a women obstetrician gynaecologist as their doctor, men also explore a career as a gynaecologist and there are ample amounts of male doctors in the field who are gynaecologists and aid women during delivery and childbirth.
The audiologist career involves audiology professionals who are responsible to treat hearing loss and proactively preventing the relevant damage. Individuals who opt for a career as an audiologist use various testing strategies with the aim to determine if someone has a normal sensitivity to sounds or not. After the identification of hearing loss, a hearing doctor is required to determine which sections of the hearing are affected, to what extent they are affected, and where the wound causing the hearing loss is found. As soon as the hearing loss is identified, the patients are provided with recommendations for interventions and rehabilitation such as hearing aids, cochlear implants, and appropriate medical referrals. While audiology is a branch of science that studies and researches hearing, balance, and related disorders.
An oncologist is a specialised doctor responsible for providing medical care to patients diagnosed with cancer. He or she uses several therapies to control the cancer and its effect on the human body such as chemotherapy, immunotherapy, radiation therapy and biopsy. An oncologist designs a treatment plan based on a pathology report after diagnosing the type of cancer and where it is spreading inside the body.
Are you searching for an ‘Anatomist job description’? An Anatomist is a research professional who applies the laws of biological science to determine the ability of bodies of various living organisms including animals and humans to regenerate the damaged or destroyed organs. If you want to know what does an anatomist do, then read the entire article, where we will answer all your questions.
For an individual who opts for a career as an actor, the primary responsibility is to completely speak to the character he or she is playing and to persuade the crowd that the character is genuine by connecting with them and bringing them into the story. This applies to significant roles and littler parts, as all roles join to make an effective creation. Here in this article, we will discuss how to become an actor in India, actor exams, actor salary in India, and actor jobs.
Individuals who opt for a career as acrobats create and direct original routines for themselves, in addition to developing interpretations of existing routines. The work of circus acrobats can be seen in a variety of performance settings, including circus, reality shows, sports events like the Olympics, movies and commercials. Individuals who opt for a career as acrobats must be prepared to face rejections and intermittent periods of work. The creativity of acrobats may extend to other aspects of the performance. For example, acrobats in the circus may work with gym trainers, celebrities or collaborate with other professionals to enhance such performance elements as costume and or maybe at the teaching end of the career.
Career as a video game designer is filled with excitement as well as responsibilities. A video game designer is someone who is involved in the process of creating a game from day one. He or she is responsible for fulfilling duties like designing the character of the game, the several levels involved, plot, art and similar other elements. Individuals who opt for a career as a video game designer may also write the codes for the game using different programming languages.
Depending on the video game designer job description and experience they may also have to lead a team and do the early testing of the game in order to suggest changes and find loopholes.
Radio Jockey is an exciting, promising career and a great challenge for music lovers. If you are really interested in a career as radio jockey, then it is very important for an RJ to have an automatic, fun, and friendly personality. If you want to get a job done in this field, a strong command of the language and a good voice are always good things. Apart from this, in order to be a good radio jockey, you will also listen to good radio jockeys so that you can understand their style and later make your own by practicing.
A career as radio jockey has a lot to offer to deserving candidates. If you want to know more about a career as radio jockey, and how to become a radio jockey then continue reading the article.
The word “choreography" actually comes from Greek words that mean “dance writing." Individuals who opt for a career as a choreographer create and direct original dances, in addition to developing interpretations of existing dances. A Choreographer dances and utilises his or her creativity in other aspects of dance performance. For example, he or she may work with the music director to select music or collaborate with other famous choreographers to enhance such performance elements as lighting, costume and set design.
A career as social media manager involves implementing the company’s or brand’s marketing plan across all social media channels. Social media managers help in building or improving a brand’s or a company’s website traffic, build brand awareness, create and implement marketing and brand strategy. Social media managers are key to important social communication as well.
Photography is considered both a science and an art, an artistic means of expression in which the camera replaces the pen. In a career as a photographer, an individual is hired to capture the moments of public and private events, such as press conferences or weddings, or may also work inside a studio, where people go to get their picture clicked. Photography is divided into many streams each generating numerous career opportunities in photography. With the boom in advertising, media, and the fashion industry, photography has emerged as a lucrative and thrilling career option for many Indian youths.
An individual who is pursuing a career as a producer is responsible for managing the business aspects of production. They are involved in each aspect of production from its inception to deception. Famous movie producers review the script, recommend changes and visualise the story.
They are responsible for overseeing the finance involved in the project and distributing the film for broadcasting on various platforms. A career as a producer is quite fulfilling as well as exhaustive in terms of playing different roles in order for a production to be successful. Famous movie producers are responsible for hiring creative and technical personnel on contract basis.
In a career as a copywriter, one has to consult with the client and understand the brief well. A career as a copywriter has a lot to offer to deserving candidates. Several new mediums of advertising are opening therefore making it a lucrative career choice. Students can pursue various copywriter courses such as Journalism, Advertising, Marketing Management. Here, we have discussed how to become a freelance copywriter, copywriter career path, how to become a copywriter in India, and copywriting career outlook.
In a career as a vlogger, one generally works for himself or herself. However, once an individual has gained viewership there are several brands and companies that approach them for paid collaboration. It is one of those fields where an individual can earn well while following his or her passion.
Ever since internet costs got reduced the viewership for these types of content has increased on a large scale. Therefore, a career as a vlogger has a lot to offer. If you want to know more about the Vlogger eligibility, roles and responsibilities then continue reading the article.
For publishing books, newspapers, magazines and digital material, editorial and commercial strategies are set by publishers. Individuals in publishing career paths make choices about the markets their businesses will reach and the type of content that their audience will be served. Individuals in book publisher careers collaborate with editorial staff, designers, authors, and freelance contributors who develop and manage the creation of content.
Careers in journalism are filled with excitement as well as responsibilities. One cannot afford to miss out on the details. As it is the small details that provide insights into a story. Depending on those insights a journalist goes about writing a news article. A journalism career can be stressful at times but if you are someone who is passionate about it then it is the right choice for you. If you want to know more about the media field and journalist career then continue reading this article.
Individuals in the editor career path is an unsung hero of the news industry who polishes the language of the news stories provided by stringers, reporters, copywriters and content writers and also news agencies. Individuals who opt for a career as an editor make it more persuasive, concise and clear for readers. In this article, we will discuss the details of the editor's career path such as how to become an editor in India, editor salary in India and editor skills and qualities.
Individuals who opt for a career as a reporter may often be at work on national holidays and festivities. He or she pitches various story ideas and covers news stories in risky situations. Students can pursue a BMC (Bachelor of Mass Communication), B.M.M. (Bachelor of Mass Media), or MAJMC (MA in Journalism and Mass Communication) to become a reporter. While we sit at home reporters travel to locations to collect information that carries a news value.
Are you searching for a Corporate Executive job description? A Corporate Executive role comes with administrative duties. He or she provides support to the leadership of the organisation. A Corporate Executive fulfils the business purpose and ensures its financial stability. In this article, we are going to discuss how to become corporate executive.
A multimedia specialist is a media professional who creates, audio, videos, graphic image files, computer animations for multimedia applications. He or she is responsible for planning, producing, and maintaining websites and applications.
Welding Engineer Job Description: A Welding Engineer work involves managing welding projects and supervising welding teams. He or she is responsible for reviewing welding procedures, processes and documentation. A career as Welding Engineer involves conducting failure analyses and causes on welding issues.
A quality controller plays a crucial role in an organisation. He or she is responsible for performing quality checks on manufactured products. He or she identifies the defects in a product and rejects the product.
A quality controller records detailed information about products with defects and sends it to the supervisor or plant manager to take necessary actions to improve the production process.
A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.
A QA Lead is in charge of the QA Team. The role of QA Lead comes with the responsibility of assessing services and products in order to determine that he or she meets the quality standards. He or she develops, implements and manages test plans.
A Structural Engineer designs buildings, bridges, and other related structures. He or she analyzes the structures and makes sure the structures are strong enough to be used by the people. A career as a Structural Engineer requires working in the construction process. It comes under the civil engineering discipline. A Structure Engineer creates structural models with the help of computer-aided design software.
The Process Development Engineers design, implement, manufacture, mine, and other production systems using technical knowledge and expertise in the industry. They use computer modeling software to test technologies and machinery. An individual who is opting career as Process Development Engineer is responsible for developing cost-effective and efficient processes. They also monitor the production process and ensure it functions smoothly and efficiently.
An AWS Solution Architect is someone who specializes in developing and implementing cloud computing systems. He or she has a good understanding of the various aspects of cloud computing and can confidently deploy and manage their systems. He or she troubleshoots the issues and evaluates the risk from the third party.
An Azure Administrator is a professional responsible for implementing, monitoring, and maintaining Azure Solutions. He or she manages cloud infrastructure service instances and various cloud servers as well as sets up public and private cloud systems.
Careers in computer programming primarily refer to the systematic act of writing code and moreover include wider computer science areas. The word 'programmer' or 'coder' has entered into practice with the growing number of newly self-taught tech enthusiasts. Computer programming careers involve the use of designs created by software developers and engineers and transforming them into commands that can be implemented by computers. These commands result in regular usage of social media sites, word-processing applications and browsers.
A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.
Individuals in the information security manager career path involves in overseeing and controlling all aspects of computer security. The IT security manager job description includes planning and carrying out security measures to protect the business data and information from corruption, theft, unauthorised access, and deliberate attack
An Automation Test Engineer job involves executing automated test scripts. He or she identifies the project’s problems and troubleshoots them. The role involves documenting the defect using management tools. He or she works with the application team in order to resolve any issues arising during the testing process.
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