which of the following species has greater polarizing power and why? a)fe3+ or fe2+ b)cu2+ or na+

a) Fe3has more polarising power than Fe2. According to Fajan's rule , greater the charge on the cation , greater is the covalent character of the ionic bond.
b) Cu2has more polarising power than Na+ . According to Fajan's rule, cations with (n-1) d​x ns (typical of transition metal
cations) has more polarising power than the alkali metals with the noble gas configuration , ns2np6 (typical of alkali and alkaline earth metal cations).  Cu2 has an electronic configuration as  [A]4s​13d10. So, it is more polarisable.

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