NCERT Solutions for Class 10 Science Chapter 5 – CBSE Access Free PDF
NCERT solutions for class 10 science chapter 5 - Welcome to Careers360 class 10 science chapter 5 question answer - Periodic Classification of Elements! If you are a Class 10 student seeking to comprehend the NCERT Solution of the periodic classification of elements related to the periodic table, you are in the right place. Our expert educators have meticulously crafted these class 10 science chapter 5 exercise question answer to align perfectly with the CBSE guidelines and the NCERT textbook. With our user-friendly and accurate solutions, you can strengthen your understanding of the periodic table and enhance your performance in exams.
NCERT Solutions for Class 10 Science Chapter 5 Periodic Classification of Elements Periodic Classification of Elements is the 5th chapter of NCERT Class 10 science book. While studying this chapter and solving questions, students can get help from NCERT Periodic Classification of Elements Class 10 Science chapter 5 solutions for more clarification. We have provided solutions for all the questions asked in the book. Students looking for NCERT Solutions for Periodic Classification of Elements Class 10 science chapter 5 pdf download can be used to prepare offline.
This article proves to be beneficial in comprehending the class 10 science ch 5 NCERT solutions. It provides a comprehensive understanding of the exercise questions, aiding in the completion of assignments and preparation for exams.
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NCERT Solutions for Class 10 Science: Important Formulas and Diagrams + eBook link
The class 10 science chapter 5 exercise question answer provides a valuable resource for students to understand important formulas and diagrams in a concise and comprehensive manner. This eBook link offers easy access to the solutions, enabling students to reinforce their knowledge and excel in their Science studies and exams. With expertly curated content and step-by-step explanations, these NCERT class 10 science chapter 5 exercise solutions are designed to enhance learning and boost academic performance.
In 1817, Dobereiner arranged some elements into groups that had similar properties. He called these groups triads. When these elements were arranged in the increasing sequence of increasing atomic masses, the atomic mass of the middle element was found to be approximately equal to the average of the atomic masses of the other two elements.
Download Ebook - NCERT Class 10 Science: Chapterwise Important Formulas, Diagrams, And Points
NCERT Solutions for Class 10 Science Chapter 5 Periodic Classification of Elements - Important Topics
Important Topics Covered in class 10 science chapter 5 exercise question answer– Periodic Classification Of Elements:
- Early Attempts At the Classification of Elements:
Dobereiner's Triads: Concept and Examples
Newlands' Law of Octaves: Explanation and Examples
- Mendeleev’s Periodic Table:
Introduction to Mendeleev's Periodic Table
Achievements of Mendeleev's Classification
Limitations of Mendeleev's Periodic Table
- The Modern Periodic Table:
Definition and Features of the Modern Periodic Table
Position of Elements in the Modern Periodic Table
Trends in the Modern Periodic Table: Valency, Atomic Size, Metallic and Non-metallic Properties
The chapter periodic classification of elements class 10 solutions explores the early attempts at element classification, such as Dobereiner's Triads and Newlands' Law of Octaves. It then goes into Mendeleev's Periodic Table, noting both its successes and weaknesses. Finally, the Modern Periodic Table is introduced, with characteristics, element placements, and trends in element attributes discussed. Understanding these fundamental concepts is critical for students to understand periodicity and element arrangement in the periodic table.
Download Class 10 science chapter 5 question answer Periodic Classification of Elements for free.
According to the latest update on the CBSE Syllabus 2023-24, the chapter "Periodic Classification Of Elements" has been removed from the Class 10 Science syllabus. Students are advised to refer to the updated CBSE NCERT syllabus to stay informed about the topics that will be covered in their examinations.
NCERT Solutions for Class 10 Science Chapter 5 Periodic Classification of Elements
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Access Answer to NCERT Class 10 Science Chapter 5: Periodic Classification of Elements
Below are NCERT class 10 science chapter 5 exercise solutions, organized by topic for better student comprehension and use:
Topic 5.1 Making order out of chaos - Early attempts at the classification of elements
Q.1. Did Döbereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.
Answer:
Yes, Dobereiner's triads also exist in the column of Newland's octaves.
Newland's law of octaves, says that every eight elements had properties similar to that of the first.
For example, the element Lithium, sodium, and potassium are present in the second column of Newland's classification of elements. If lithium is the first element then, the sodium will be the 8th element and considering again sodium as the 1st element, then the 8th element will be potassium.
So, that means according to Newland's Law of octaves, lithium, sodium, and potassium should have similar properties and also these elements form a Dobereiner's traid having similar chemical properties.
Q.3. What were the limitations of Newlands’ Law of Octaves?
Answer :
The limitations of Newland's law of octaves are:
(1) It was found that the Law of Octaves was applicable only up to calcium, as after calcium every eighth element did not possess properties similar to that of the first.
(2) It was assumed by Newlands that only 56 elements existed in nature and no more elements would be discovered in the future. But, later on, several new elements were discovered, whose properties did not fit into the Law of Octaves.
(3) Newland put two elements together in one slot and that too in the column of unlike elements having different properties.
Example: Cobalt and Nickel were put together in just one slot and that too in the column of elements like fluorine, chlorine, and bromine which were very different properties from these elements.
Q.3. What were the criteria used by Mendeléev in creating his Periodic Table?
Answer:
The criteria used by Mendeleev in creating his periodic table were:
(i) The atomic mass of the elements was used to arrange the elements.
(ii) Grouping the elements according to their similar chemical properties.
And hence proposed that the chemical properties of the elements are the periodic function of their atomic masses and thus he arranged the elements according to the increasing order of atomic masses.
NCERT solutions for class 10 science chapter 5 Periodic Classification of Elements
Topic 5.3: Making order out of chaos: The Modern Periodic Table
Q.1. How could the Modern Periodic Table remove various anomalies of Mendeléev’s Periodic Table?
Answer:
Modern periodic table removes, various anomalies of Mendeleev's periodic table as follows:
(1) In the modern periodic table, elements are arranged in the increasing order of their atomic number, not in the atomic mass.
(2) In the modern periodic table, the isotopes are placed in the same place as they having the same atomic number but different atomic masses.
(3) Now, the same group elements have the same number of valence electrons.
(4) Hydrogen is now placed in the group containing the same valence electrons.
Q.3. (a) Name
- Three elements that have a single electron in their outermost shells.
Answer:
Single valence electron elements are: (a) Lithium, Sodium, and Potassium .
Q.3.(b) Name
Answer:
Magnesium and Calcium have two electrons in their outermost shells.
Q.3. (c) Name
Answer:
The elements which have fully filled outermost shells are noble gases.
Example: Helium, Neon, and Argon.
Q.3.(a) Which element has
- two shells, both of which are completely filled with electrons?
Answer:
The element which has two shells, which are both completely filled with electrons is,
Neon with electronic configuration 
.
Q.3.(b) Which element has
- The electronic configuration 2, 8, 2?
Answer:
The given electronic configuration 
is of Magnesium (Mg).
Q.3. (c) Which element has
- A total of three shells, with four electrons in its valence shell?
Answer:
The element having three shells and four electrons in its valence shell is Silicon (Si) .
Q.3. (d) Which element has
- A total of two shells, with three electrons in its valence shell?
Answer:
The element having two shells and three electrons in its valence shell is Boron (B) .
Q.3. (e) Which element has
- Twice as many electrons in its second shell as in its first shell?
Answer:
The element having twice as many electrons in its second shell as in its first shell will be:
Carbon with electronic configuration: 
Q.5. An atom has electronic configurations 2, 8, and 7.
(a) What is the atomic number of this element?
(b) To which of the following elements would it be chemically similar? (Atomic numbers are given in parentheses.)
Answer:
The electronic configuration: 
is of Chlorine.
(a) The atomic number of this element will be: 
.
(b) It will be chemically similar to the element Fluorine (9) as it also has the same number of valence electrons in its valence shell.
Q.6.(b) The position of three elements A, B, and C in the Periodic Table are shown below –
- State whether C is more reactive or less reactive than A.
Answer:
Element C is less reactive than A because in the halogens the reactivity decreases as we move down. This happens because as we move down the nuclear attraction increases due to an increase in atomic mass. Stronger attraction toward electron will make it harder to react with any other element that's why they are less reactive.
Q.8. How does the electronic configuration of an element relate to its position in the Modern Periodic Table?
Answer:
The electronic configuration of an element gives the distribution of electrons in various shells present in the element. The atoms with similar electronic configuration are placed in the same column, hence groups have the same number of valence electrons.
Group number can be known by knowing the number of valence electrons.
The number of shells present in an element is equal to the period number.
Thus, the information of electronic configuration is enough to know the group and period number of an element.
Q.10. Compare and contrast the arrangement of elements in Mendeléev’s Periodic Table and the Modern Periodic Table.
Answer:
| Mendeleev's periodic table | Modern periodic table |
| Elements are arranged in the increasing order of their atomic masses | Elements are arranged in the increasing order of their atomic numbers |
| Consists of 8 groups | Consists of 18 groups |
| Groups are categorized into subgroups 'a' and 'b' | No subdivision of groups. |
| Noble gases were not grouped since they were not discovered yet | Noble gases were grouped together at the end of the table. |
| There was no place for isotopes | Slots for isotopes present according to atomic number |
NCERT Class 10 Science Solutions Chapter 5 - Weightage in Board Exams
The Class 10 science chapter 5 exercise solutions on Periodic Classification of Elements have been excluded from the CBSE syllabus for the academic year 2023-24, and as a result, it will not be included in the Class 10 Science board exam. Even though the chapter has been removed, it's worth noting that understanding the fundamental concepts of periodicity and the periodic table can be beneficial for students in comprehending other chapters in the syllabus, such as Chemical Bonding and Chemical Thermodynamics.
For students preparing for the ch 5 science class 10 Science exam, it is advisable to prioritize studying the other chapters that are part of the syllabus. While the chapter on Periodic Classification of Elements can be used as a reference, studying it in detail is not essential for the exam.
Some key points to remember from class 10 Science chapter 5 NCERT solutions:
key points from NCERT Class 10 Science Chapter 5, "Periodic Table":
Periodic Classification: The class 10 science ch 5 question answer introduces the concept of periodic classification of elements, which is the arrangement of elements in order of their atomic number so that elements with similar properties are placed together.
Early Attempts: science chapter 5 class 10 discusses early periodic classification attempts, such as Dobereiner's triads and Newlands' law of octaves, which established the groundwork for organising elements based on their properties.
Mendeleev's Periodic Table: The chapter explores Mendeleev's pioneering work in creating the periodic table. He arranged elements based on their increasing atomic mass and left gaps for undiscovered elements, accurately predicting their properties.
Modern Periodic Table: Students learn about the modern periodic table, which is organized based on atomic numbers. The table consists of 18 vertical columns known as groups and 7 horizontal rows known as periods.
Trends in the Periodic Table: The class 10 chapter 5 science discusses important periodic table trends such as atomic size, ionisation energy, and electronegativity, helping in understanding the periodic behaviour of elements.
Applications: The periodic table serves as a powerful tool for predicting element properties, understanding chemical reactions, and identifying elements with specific characteristics, making it an indispensable resource for scientists and researchers.
By studying this periodic table ch 5 science class 10 NCERT solutions, students gain a deeper understanding of the organization and significance of the periodic table, a fundamental concept in chemistry that forms the basis for understanding the properties and behaviour of elements.
Key Features of NCERT Solutions for Class 10 Science Chapter 5 Periodic Classification of Elements
These class 10 science ch 5 question answer cover all the questions mentioned in the chapter.
NCERT solutions for Class 10 science chapter 5 are prepared by the experts as per CBSE guidelines.
These NCERT Class 10 Science solutions chapter 5 are prepared in simple language. Students will get a very good explanation of the solution for each question.
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