Discuss the main postulates of Werner’s coordination theory.

Explanation

The main postulates of this theory are as follows :
i) Metals possess two types of valencies.
a) Primary or ionizable valency.
b) Secondary or non-ionizable valency.
ii) Every metal has tendency to satisfy both its primary and secondary valencies.
iii) Secondary valencies are always directed towards fixed position. They give a definite geometry to the complex.
iv) Primary valencies are .non directional. They correspond to oxidation number of central atom.