on which bases fajan rule explain ionic bond ?mean how electron are completely removed from one atom to other on basis of fajan rule

To check the solubility of the crystnls that is ionic compounds, Fazan’s rule is valid.

Now to check it, Remmebr and follow this procedure:

If the ions including from the first or second group metals then always decide the solubility factor by the size Difference.
But if it is from other than that group then use Fazan’s rule then after only the Fazan’s rule is valid.