Question

Explain the bonding in coordination compounds in terms of Werner’s postulates.

Answer 1

In order to explain the nature ofbonding & structure of coordination compounds,Werner in 1893 proposed a theory called as Werner's Coordination Theory.The postulates of theory are as follows: 1.In coordination compounds,metal atoms exhibit 2 types of valencies namely, primary & secondary valency.

Answer 2

Answer:

( a ) A metal shows two kinds of valencies viz primary valency and secondary valency.Negative ionssatisfy primary valenciesand secondaryvalencies are filled by bothneutral ions  and negative ions.

( b ) A metal ion has a fixed  amount of secondary valencies about the central atom. These valenciesalso orient themselves in a particular  direction in the space provided to the definite geometry of the coordination compound.

( c ) Secondary valencies cannot be ionized , while primary valencies can usually be ionized.