This edition contains chapters with expanded coverage of d-block elements and its electronic configuration and properties, coordination chemistry includes coordinate bond, classification of ligand, chelate, coordination number and geometry, IUPAC nomenclature. Detail discussion of metal carbonyls and nitrosyls which includes preparation, properties and structure, nature of M-CO bond. Isomerism in 4-coordinate and 6-coordinate compounds includes structural and optical isomerism with numbers of examples and also discussion of different methods to distinguish different isomers.