Write the basic postulates of Werner's t...

Write the basic postulates of Werner's theory.

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(a) In co-ordination compounds metal atom shows two types of valencies.
(i) Primary valency (ii) Secondary valency.
(b) The primary valency is ionisable and are satisfied by negative ions.
(c ) The secondary valency is non-ionisable and are satisfied by negative ions or neutral molecules.
(d) The primary valency is the oxidation number and secondary valency is co-ordination number of the metal atom.

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