About Fajans proposal, polarizability and strength of ionic/covelent bond
1-according to Fajans proposal as the ionic radius decreases the polarization power of an ion increases and vice versa hence the order of polarizing power of the alkaline metals according to the decline in their atomic radius Li+>Na+>K+ and declines as going down this IA group
2- according to Fajans proposal as the ionic charge increases the polarization power of an ion decreases and vice versa thus the order of polarizing power of metals according to their charges is as follows Al+3 > Mg+2 > Na+
3- Charge (Q)/ radius (r) ratio determines the polarization effect or power of cations therefore, cations with large radius but small high have best polarization effect
4- according to Fajans proposal ionic charge, ionic radius and the valance shell structure are not related to the ionic bond strength
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