what is the difference btw primary and secondry valency?

Primary Valency 

Secondary Valency

Primary valency may be defined as +ve charge raised over central metal ion as its oxidation state

Secondary valency may be defined as no of mono dentate or equivalent to mondentate ligand attached to central metal ion. It defines the Coordination No.

It is ionisable and variable

It is non ionisable and fixed

Example: [Cr(H2O)6]Cl3 = Primary valency is satisfied by Chloride ion and is equal to 3.

Secondary valency is satisfied by H2O molecules and is equal to 6.

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thankyou ishaan you help me a lot

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