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Question
Explain the bonding in coordination compounds in terms of Werner’s postulates.
Solution
The main postulates are:
- In coordination compounds, metals show two types of valencies – primary and secondary.
- Primary valencies are generally related to the oxidation state of the metal atom and are ionizable. These valencies are satisfied by negative ions.
- Secondary valencies are related to the coordination number of the metal atom. Secondary valencies are non-ionizable. They are satisfied by neutral molecules or negative ions. Secondary valency is equal to the coordination number and its value is generally fixed for a metal.
- The ion groups bonded to the metal through secondary valence are specifically arranged in space corresponding to different coordination numbers.
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