With regards to the above statement, I got this explanation: cations with pseudo inert gas configuration i.e, ns2p6d10 or with inert pair configuration i.e; d10(n+1)s2, have greater ENC (Effective Nuclear Charge) than cations with noble gas configuration, ns2p6.
Now my question is: how is ENC greater in the 1st case(cation) & smaller in next case?
Try to apply Slater rules to your problem (http://en.wikipedia.org/wiki/Slater's_rules). Of course, these do not supply an explanation as such. In order to understand you will have to analyse the differing radial distribution functions for s, p, and d orbitals. Electrons in s orbitals shield the nuclear charge more efficiently than those in p orbitals. Electrons in d orbitals are even less efficient and so forth.
By the way, the electronic configurations you cite as examples appear to be incomplete.
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