what is the difference btw primary and secondry valency - Chemistry - Coordination Compounds

Question

what is the difference btw primary and secondry valency?

Ishan Goyal · Accepted Answer

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

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