Question

Main postulates of Werner's theory ?​

Answer 1

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⭕Main postulates of Werner's theory⭕

(a) The central metal atom ion in a coordination compound exhibits two types of valencies - primary and secondary

(b) Primary valencies are ionisable and correspond to the number of charges on the complex ion. Primary valencies apply equally well to simple salts and to complexes and are satisfied by negative ions.

(c) Secondary valencies correspond to the valencies that a metal atom (or) ion exercises towards neutral molecules (or) negative ions in the formation of its complex ions.

d) Secondary valencies are directional and so a complex has a particular shape. The number and arrangement of ligands in space determines the stereochemistry of a complex.

Answer 2

ANSWER :

Alfred Werner put forward his famous Coordination Theory to explain the formation and structure of Coordination Compounds.

▶️In Coordination Compounds the metal atom exhibit two types of valency, viz. The primary valency corresponds to oxidation state and the secondary valency.