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I read that it is because it is easier to ionise the elements as the electrons involved are those of d orbitals which have same degeneracy. First of all, i found it very vague. Secondly, what about the poor screening effect of d and f orbitals which increases effective nuclear force on valence electrons? Would it seemingly not make difficult for the ion to bear more positive charges?

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marked as duplicate by Mithoron, Zhe, A.K., Todd Minehardt, Waylander Apr 4 at 8:33

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