NCERT Exemplar Class 10 Science Solutions Chapter 5 Periodic Classification Of Elements

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# NCERT Exemplar Class 10 Science Solutions Chapter 5 Periodic Classification Of Elements

Edited By Sumit Saini | Updated on Sep 09, 2022 02:02 PM IST | #CBSE Class 10th

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

## NCERT Exemplar Class 10 Science Solutions Chapter 5-MCQ

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.

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

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?
(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.

## NCERT Exemplar Class 10 Science Solutions Chapter 5-Short Answer

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.
$Y= \frac{X+Z}{2}$
For example,
Lithium (Atomic mass 7), Sodium (Atomic mass 23) and Potassium (Atomic mass 39)
Average atomic mass of Li and K = $\frac{39+7}{2}= 23$

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= $\frac{23+35}{2}= \frac{58}{2}$
= 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= $\frac{9+40}{2}= 24\cdot 5$
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 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.
F$<$N$<$Be$<$Li
(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

 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:
Ge$<$Ga$<$Mg$<$Ca$<$K

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.

## NCERT Exemplar Class 10 Science Solutions Chapter 5-Long Answer

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.
$2Mg\left ( s \right )+O_{2}\left ( g \right )\overset{Heat}{\rightarrow}2MgO\left ( s \right )$
d) When Magnesium Oxide is dissolved in water it will form Magnesium Hydroxide.
$2MgO\left ( s \right )+2H_{2}O\left ( l \right )\rightarrow 2Mg\left ( OH \right )_{2}$
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

(a) In this ladder (Figure 5.2) symbols of elements are jumbled up. Rearrange these symbols of elements in the increasing order of their atomic number in the Periodic Table.
(b) Arrange them in the order of their group also.

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)
$2FeSO_{4}\left ( s \right )+Heat\rightarrow Fe_{2}O_{3}\left ( s \right )+SO_{2}\left ( g \right )+SO_{3}\left ( g \right )$
(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

## NCERT Exemplar Solutions Class 10 Science Chapter 5 Important Topics:

The chapter on Periodic Classification of Elements in NCERT exemplar Class 10 Science solutions chapter 5 covers the below-mentioned topics:

• Classification of the periodic table.
• NCERT exemplar Class 10 Science solutions chapter 5 discusses octave law and its limitation in the periodic table
• Classification to understand basic properties of similar group elements.

### NCERT Class 10 Exemplar Solutions for Other Subjects:

NCERT Class 10 Science Exemplar Solutions for Other Chapters:

 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 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 Human Eye and Colourful World Chapter 12 Electricity Chapter 13 Magnetic Effects of Electric Current Chapter 14 Sources of Energy Chapter 15 Our Environment Chapter 16 Management of Natural Resources

## Features of NCERT Exemplar Class 10 Science Solutions Chapter 5:

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

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1. Q1. How elements are arranged in the modern periodic table?

A1. In the modern periodic table, elements are arranged in increasing order of atomic number.

2. Q2. Orbits are also known as shells what are the standard nomenclatures of these shells?

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

3. Q3. What is atomic radius?

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.

4. Q4. Will these problems of exemplar require additional knowledge of Periodic classifications of elements?

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.

5. Q5. Is the chapter Periodic classifications of elements important for Board examinations?

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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### Questions related to CBSE Class 10th

Have a question related to CBSE Class 10th ?

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.

According to CBSE norms, a student must be 14 years old by the end of the year in which the exam will be held in order to sit for the 10th board exam. If your age is greater than 14, however, there are no limits. Therefore, based on your DOB, you will be 12 years and 6 months old by the end of December 2022. After the actual 16 June 2024, you'll be qualified to take your 10th board.

Hello aspirant,

Central Board Of Secondary Education(CBSE) is likely to declare class 10 and 12 terms 2 board result 2022 by July 15. The evaluation process is underway. Students are demanding good results and don't want to lack behind. They are requesting the board to use their best scores in Term 1 and Term 2 exams to prepare for the results.

CBSE concluded board exams 2022 for 10, and 12 on June 15 and May 24. Exams for both classes began on April 26. A total of 35 lakh students including 21 lakh class 10 students and 14 lakh class 12 students appeared in exams and are awaiting their results.

You can look for your results on websites- cbse.gov (//cbse.gov) .in, cbseresults.nic.in

Thank you

Sir, did you get any problem in result
I have also done this same mistake in board 2023 exam

Hello SIR CBSE board 9th class admission 2022 Kara Raha hu entrance ki problem hai please show the Entrance for Baal vidya mandir school sambhal

A block of mass 0.50 kg is moving with a speed of 2.00 ms-1 on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is

 Option 1) Option 2) Option 3) Option 4)

A person trying to lose weight by burning fat lifts a mass of 10 kg upto a height of 1 m 1000 times.  Assume that the potential energy lost each time he lowers the mass is dissipated.  How much fat will he use up considering the work done only when the weight is lifted up ?  Fat supplies 3.8×107 J of energy per kg which is converted to mechanical energy with a 20% efficiency rate.  Take g = 9.8 ms−2 :

 Option 1) 2.45×10−3 kg Option 2)  6.45×10−3 kg Option 3)  9.89×10−3 kg Option 4) 12.89×10−3 kg

An athlete in the olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range

 Option 1) Option 2) Option 3) Option 4)

A particle is projected at 600   to the horizontal with a kinetic energy . The kinetic energy at the highest point

 Option 1) Option 2) Option 3) Option 4)

In the reaction,

 Option 1)   at STP  is produced for every mole   consumed Option 2)   is consumed for ever      produced Option 3) is produced regardless of temperature and pressure for every mole Al that reacts Option 4) at STP is produced for every mole Al that reacts .

How many moles of magnesium phosphate, will contain 0.25 mole of oxygen atoms?

 Option 1) 0.02 Option 2) 3.125 × 10-2 Option 3) 1.25 × 10-2 Option 4) 2.5 × 10-2

If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will

 Option 1) decrease twice Option 2) increase two fold Option 3) remain unchanged Option 4) be a function of the molecular mass of the substance.

With increase of temperature, which of these changes?

 Option 1) Molality Option 2) Weight fraction of solute Option 3) Fraction of solute present in water Option 4) Mole fraction.

Number of atoms in 558.5 gram Fe (at. wt.of Fe = 55.85 g mol-1) is

 Option 1) twice that in 60 g carbon Option 2) 6.023 × 1022 Option 3) half that in 8 g He Option 4) 558.5 × 6.023 × 1023

A pulley of radius 2 m is rotated about its axis by a force F = (20t - 5t2) newton (where t is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation is 10 kg m2 , the number of rotations made by the pulley before its direction of motion if reversed, is

 Option 1) less than 3 Option 2) more than 3 but less than 6 Option 3) more than 6 but less than 9 Option 4) more than 9
##### Bio Medical Engineer

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.

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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.

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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.

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The career as a Talent Agent is filled with responsibilities. A Talent Agent is someone who is involved in the pre-production process of the film. It is a very busy job for a Talent Agent but as and when an individual gains experience and progresses in the career he or she can have people assisting him or her in work. Depending on one’s responsibilities, number of clients and experience he or she may also have to lead a team and work with juniors under him or her in a talent agency. In order to know more about the job of a talent agent continue reading the article.

If you want to know more about talent agent meaning, how to become a Talent Agent, or Talent Agent job description then continue reading this article.

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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.

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The career of a travel journalist is full of passion, excitement and responsibility. Journalism as a career could be challenging at times, but if you're someone who has been genuinely enthusiastic about all this, then it is the best decision for you. Travel journalism jobs are all about insightful, artfully written, informative narratives designed to cover the travel industry. Travel Journalist is someone who explores, gathers and presents information as a news article.

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Careers in videography are art that can be defined as a creative and interpretive process that culminates in the authorship of an original work of art rather than a simple recording of a simple event. It would be wrong to portrait it as a subcategory of photography, rather photography is one of the crafts used in videographer jobs in addition to technical skills like organization, management, interpretation, and image-manipulation techniques. Students pursue Visual Media, Film, Television, Digital Video Production to opt for a videographer career path. The visual impacts of a film are driven by the creative decisions taken in videography jobs. Individuals who opt for a career as a videographer are involved in the entire lifecycle of a film and production.

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An SEO Analyst is a web professional who is proficient in the implementation of SEO strategies to target more keywords to improve the reach of the content on search engines. He or she provides support to acquire the goals and success of the client’s campaigns.

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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.

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Quality Assurance Manager Job Description: A QA Manager is an administrative professional responsible for overseeing the activity of the QA department and staff. It involves developing, implementing and maintaining a system that is qualified and reliable for testing to meet specifications of products of organisations as well as development processes.

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Are you searching for a Reliability Engineer job description? A Reliability Engineer is responsible for ensuring long lasting and high quality products. He or she ensures that materials, manufacturing equipment, components and processes are error free. A Reliability Engineer role comes with the responsibility of minimising risks and effectiveness of processes and equipment.

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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.

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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.

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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

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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.

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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.

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ITSM Manager is a professional responsible for heading the ITSM (Information Technology Service Management) or (Information Technology Infrastructure Library) processes. He or she ensures that operation management provides appropriate resource levels for problem resolutions. The ITSM Manager oversees the level of prioritisation for the problems, critical incidents, planned as well as proactive tasks.

3 Jobs Available
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.NET Developer Job Description: A .NET Developer is a professional responsible for producing code using .NET languages. He or she is a software developer who uses the .NET technologies platform to create various applications. Dot NET Developer job comes with the responsibility of  creating, designing and developing applications using .NET languages such as VB and C#.

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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.

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A DevOps Architect is responsible for defining a systematic solution that fits the best across technical, operational and and management standards. He or she generates an organised solution by examining a large system environment and selects appropriate application frameworks in order to deal with the system’s difficulties.

2 Jobs Available
##### Cloud Solution Architect

Individuals who are interested in working as a Cloud Administration should have the necessary technical skills to handle various tasks related to computing. These include the design and implementation of cloud computing services, as well as the maintenance of their own. Aside from being able to program multiple programming languages, such as Ruby, Python, and Java, individuals also need a degree in computer science.

2 Jobs Available