Fajan gives the following four rules for the Polarisation:Polarization will be increased by:
1. High charge and small size of the cation.
2. High charge and large size of the anion.3. The polarizability of an anion is related to the deformability of its electron cloud (i.e. its “softness”)4. An incomplete valence shell electron configuration. Noble gas configuration of the cation produces better shielding and less polarizing power

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it is important question in plus one examination this question was came once
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Larger the cation and smaller the anion of the compound,more will be th  covalent nature of the compound and vice versa for ionic charchter
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