Bonding in co-ordination compounds (Werner's Coordination theory)
The scientist named Werner was able to explain the bonding in complex.
Primary valency (Pv) : This is non- directional and ionizable. Actually it is the positive charge on the metal ion.
Secondary valency (Sv) : This is directional and non- ionizable. It is equal to number of the ligand atoms co-ordinated to the metal (co-ordination number). Example of it can be seen in the table which is drawn below :
The nature of the complex may be understood by treating the above complexes with excess of AgNo3
The nature of bonding between central metal atom and ligands in the coordination sphere has been explained by the three well-known theories.
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