3.1 Kossel – Lewis approach to chemical bonding.

3.2 Ionic or electrovalent bond - Factors favourable for the

    formation of ionic compounds-Crystal structure of

    sodium chloride-General properties of ionic compounds.

3.3 Bond Parameters – bond length, bond angle, and bond

    enthalpy, bond order, resonance-Polarity of bonds

    dipole moment

3.4 Valence Shell Electron Pair Repulsion (VSEPR) theories.

    Predicting the geometry of simple molecules.

3.5 Valence bond theory-Orbital overlap concept-Directional

    properties of bonds-overlapping of atomic orbitals

    strength of sigma and pi bonds-Factors favouring the

    formation of covalent bonds

3.6 Hybridisation- different types of hybridization involving

    s, p and d orbitals- shapes of simple covalent molecules.

3.7 Coordinate bond –definition with examples.

3.8 Molecular orbital theory – Formation of molecular orbitals,

    Linear combination of atomic orbitals (LCAO)-conditions for

    combination of atomic orbitals - Energy level diagrams for

    molecular orbitals -Bonding in some homo nuclear diatomic

    molecules- H<sub>2</sub>,He2,Li2,B2,C2,N2,and O2

3.9 Hydrogen bonding-cause of formation of hydrogen bond-

    Types of hydrogen bonds-inter and intra molecular-General

    properties of hydrogen bonds.