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Extra stability of completely filled d-subshell in comparison with other d-sub shell configurations is due to

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Symmetrical distribution of electrons in the d-subshell

Smaller columbic repulsion energy

Small shielding by the nucleus of atom (or) ion

Large exchange energy of electrons

answer is A, C, D.

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Detailed Solution

Extra stability is due to the symmetrical distribution of electrons, Smaller columbic repulsion energy and larger exchange energy.

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