What are Fajan’s Rule?

The extent of polarization depends upon the polarization power of the cation and the polarizability of the anion.

There are the following rules:

  1. Small positive ion favours covalency.
  2. A lagre negative ion favours covalency.
  3. High charge on either ion or on both ions favours covalency.
  4. Cations with inert gas configuration have low polarization power.

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