UNIT-I (7 Hrs.) 
Chemical Bonding-II Ionic Solids – Concept of close packing., Ionic structures, (NaCl type, Zinc blende, Wurtzite, CaF2 and antifluorite), radius ratio rule and coordination number, limitation of radius ratio rule, lattice defects, semiconductors. 
                                                  UNIT-II (8 Hrs.)
Chemical Bonding-III Lattice energy and Born-Haber cycle, solvation energy and solubility of ionic solids, polarizing power and polarisability of ions, Fajan’s rule. Metallic bond-free electron, valence bond and band theories. Weak Interactions – Hydrogen bonding, Van der Waals forces. 
                                                   UNIT-III (7 Hrs.)
p-Block Elements-I Comparative study (including diagonal relationship) of groups 13-14 elements, compounds like hydrides,oxides, oxyacids and halides of groups 13-14, hydrides of boron-diborane and higher boranes, borazine,borohydrides, fullerenes, carbides, fluorocarbons. 
                                                  UNIT-IV (8 Hrs.) 
p-Block Elements-II Comparative study of groups 15-17 elements, compounds like hydrides, oxides, oxyacids and halides of groups 15-17, silicates (structural principle), tetrasulphur tetranitride, basic properties of halogens, interhalogens and polyhalides.