Write any two postulates of werner theory of Co-ordination compounds.

Explanation

A metal atom or ion possesses two types of valencies i.e., primary (ionisable valency) and secondary valency (non-ionisable valency)
2. The primary valency of a metal is the charge on the metal ion and the valency is its coordination number in the complex ion i.e. the number coordination bonds formed by ligands around the metal
3. The primary valency of a metal ion satisfied by the negative ions present in the molecule and the secondary valency is satisfied by the ions or the neutral molecules which act as ligands.
4. The secondary valencies of a metal are arranged in space to give a definite geometrical shape to the complex depending on the number of ligands ion.