# NCERT Solutions for Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties

## NCERT Solutions for Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties

This chapter starts with, a brief history of the periodic table and historical development of the periodic law and the periodic table and end with some discussion on physical trends like atomic sizes, ionization enthalpies etc, in the physical and chemical properties of the elements. In this chapter, there are 40 questions in the exercise. The NCERT Solutions for Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties is prepared by our subject experts. These NCERT solutions of class 11 help students in the preparation of their class 11 final examination and also helps in the preparation of various competitive exams like JEE Mains, NEET, VITEEE etc.

In NCERT Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties we will study the development of the periodic table and the periodic law. Mendeleev's periodic table was arranged elements based on their atomic masses. The modern periodic table arranges the elements in order of their atomic numbers. In the modern periodic table, elements are arranged in eighteen vertical columns( families or groups) and seven horizontal rows (periods). In CBSE Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties we will also discuss some periodic trends in the periodic table like ionization enthalpies, atomic sizes, electron gain enthalpies, electronegativity, and valence.

After completing Chemistry Chapter 3 Classification of Elements and Periodicity in Properties of Class 11 NCERT students will be able to understand periodic law; understand the significance of electronic configuration and atomic numbers as a basis for periodic classification; able to classify elements of the periodic table into four different blocks which are s, p, d, f and learn their main characteristics; understand periodic trends in chemical and physical properties of elements and explain relationship between metallic character and ionization enthalpy.

## Important points and terms of Chapter 3 Classification of Elements and Periodicity in Properties-

1. `In the modern periodic table, elements are arranged in the order of their atomic numbers in 7 horizontal rows or periods and 18 vertical columns or groups.`
2. `The first period is the smallest and sixth period is the longest.`
3. `Elements of periodic table are divided into four s, p, d, f blocks.`
4. `Elements of group 1 and 2 are s-block elements and the general valence shell electronic configuration of s-block elements is $ns^{1-2}$. `
5. `Elements of group 13, 14, 15, 16, 17 and 18 are p-block elements and the general valence shell electronic configuration of p-block elements is $ns^{2}np^{1-6}$.`
6. `Elements of group 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12 are d-block elements and the general valence shell electronic configuration of d-block elements is $(n-1)d^{1-10}ns^{1-2}$.`
7. `Elements of two horizontal rows at the bottom of the periodic table are f-block elements and the general valence shell electronic configuration of f-block elements is $\dpi{100} (n-1)f^{1-14}(n-1)d^{0-1}ns^{2}$`

## 3.1 Why do we Need to Classify Elements

3.2 Genesis of Periodic Classification

3.3 Modern Periodic Law and the present form of the Periodic Table

3.4 Nomenclature of Elements with Atomic Numbers

3.5 Electronic Configurations of Elements and the Periodic Table

3.6 Electronic Configurations and Types of Elements:s-, p-, d-, f- Blocks

3.7 Periodic Trends in Properties of Elements

NCERT Solutions for Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties- Solved Exercise Questions

View all Solved Questions of Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties here

## NCERT Solutions for class 11 Chemistry

 Chapter-1 Some basic concepts of Chemistry Chapter-2 Structure of Atom Chapter-3 Classification of Elements and Periodicity in Properties Chapter-4 Chemical Bonding and Molecular Structure Chapter-5 States of Matter Chapter-6 Thermodynamics Chapter-7 Equilibrium Chapter-8 Redox Reaction Chapter-9 Hydrogen Chapter-10 The S-Block Elements Chapter-11 The P-Block Elements Chapter-12 Organic chemistry- some basic principles and techniques Chapter-13 Hydrocarbons Chapter-14 Environmental Chemistry

## NCERT Solutions for Class 11- Subject wise

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