Write the postulates of Warner's theory.

Explanation

(i). Every metal atom has two types of valencies
1. Primary valency (or ionsible valency )
2. Secondary valency (or) non-ionsible valency
(ii) . The primary valency corresponds to the oxidation state of the metal ion. The primary valency of the metal is always satisfied by negative ions.
(iii) Secondary valency corresponds to the co-ordination number of the metal ion or atom.The secondary valencies may be satisfied by either negative ions or neutral molecules.
(iv) The molecules or ion that satisfy secondary valencies are called ligands
(v) The ligands which satisfy secondary valencies must project in definite direction in space .So the secondary valencies are directional in nature whereas the primary valencies are non-directional in nature
( vi )The ligands have unshared pair of electrons. These unshared pair of electrons are donated to central metal ion or atom in a compound.