Course Content
CHAPTER 3: CLASSIFICATION OF ELEMENTS
Section Name Topic Name 3 Classification of Elements and Periodicity in Properties 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 > 100 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
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CHAPTER 7: EQUILIBRIUM
Section Name Topic Name 7 Equilibrium 7.1 Equilibrium in Physical Processes 7.2 Equilibrium in Chemical Processes – Dynamic Equilibrium 7.3 Law of Chemical Equilibrium and Equilibrium Constant 7.4 Homogeneous Equilibria 7.5 Heterogeneous Equilibria 7.6 Applications of Equilibrium Constants 7.7 Relationship between Equilibrium Constant K, Reaction Quotient Q and Gibbs Energy G 7.8 Factors Affecting Equilibria 7.9 Ionic Equilibrium in Solution 7.10 Acids, Bases and Salts 7.11 Ionization of Acids and Bases 7.12 Buffer Solutions 7.13 Solubility Equilibria of Sparingly Soluble Salts
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CHAPTER 10: S-BLOCK ELEMENTS
Section Name Topic Name 10 The s-Block Elements 10.1 Group 1 Elements: Alkali Metals 10.2 General Characteristics of the Compounds of the Alkali Metals 10.3 Anomalous Properties of Lithium 10.4 Some Important Compounds of Sodium 10.5 Biological Importance of Sodium and Potassium 10.6 Group 2 Elements : Alkaline Earth Metals 10.7 General Characteristics of Compounds of the Alkaline Earth Metals 10.8 Anomalous Behaviour of Beryllium 10.9 Some Important Compounds of Calcium 10.10 Biological Importance of Magnesium and Calcium
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CHAPTER 12: CHARACTERIZATION OF ORGANIC COMPOUND
Section Name Topic Name 12 Organic Chemistry – Some Basic Principles and Techniques 12.1 General Introduction 12.2 Tetravalence of Carbon: Shapes of Organic Compounds 12.3 Structural Representations of Organic Compounds 12.4 Classification of Organic Compounds 12.5 Nomenclature of Organic Compounds 12.6 Isomerism 12.7 Fundamental Concepts in Organic Reaction Mechanism 12.8 Methods of Purification of Organic Compounds 12.9 Qualitative Analysis of Organic Compounds 12.10 Quantitative Analysis
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Class 11th Chemistry Online Class For 100% Result
About Lesson

Introduction

The elements in which the last electron enters the outermost s-orbital are called s-block elements. s-block has two groups (1 and 2).

Class 11 Chemistry Chapter 10 The s-Block Elements Notes and NCERT Solution
Class 11 Chemistry Chapter 10 The s-Block Elements Notes and NCERT Solution
The s-Block Elements

Diagonal Relationship

  • The similarity in the properties of definite pairs of diagonally adjacent elements in the second and third periods of the periodic table is called diagonal relationship.
  • In s-block elements Lithium is the first element of group 1 whereas Beryllium is the first elementsof Group 2.
  • Some of their properties do not match with the properties exhibited by other elements of their group.
  • Instead their properties resemble the properties of the second element of the following group due to the similarity in ionic sizes and /orcharge/radius ratio of the elements.
  • Consequently lithium and magnesium have similar properties whereas Beryllium and Aluminium exhibit similar properties.
  • This relation is called diagonal relationship.
Class 11 Chemistry Chapter 10 The s-Block Elements Notes and NCERT Solution
The s-Block Elements
Class 11 Chemistry Chapter 10 The s-Block Elements Notes and NCERT Solution
  • Both the elements are harder and lighter than the other elements.
  • Both of them react slowly with
  • The oxides and hydroxides of both the elements are less soluble.
  • The hydroxides of both the elements decompose on heating.
  • Both the elements form nitrides by combining directly with nitrogen.

6 Li+ N2 (g) = 2 Li3N

3 Mg(s) + N2 (g) = Mg3N2(s)

  • Both Li2O and MgO do not produce their superoxide by combining with excess oxygen.
  • Chlorides of both lithium (LiCl) and magnesium (MgCl2) are soluble in ethanol, are deliquescent and crystallize as hydrates.

LiCl·2H2O

MgCl2·8H2O

Class 11 Chemistry Chapter 10 The s-Block Elements Notes and NCERT Solution
The s-Block Elements
Class 11 Chemistry Chapter 10 The s-Block Elements Notes and NCERT Solution
The s-Block Elements

Atomic and Ionic Radii of alkali metals

  • In Group 1 the atom of the atomic and ionic radii increases down the group.
  • Increase in atomic number increases the size of the atom of the elements.
Class 11 Chemistry Chapter 10 The s-Block Elements Notes and NCERT Solution
Class 11 Chemistry Chapter 10 The s-Block Elements Notes and NCERT Solution
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