Which one of ...

Question

Which one of the following (a or b) electronic configuration is more stable and why?
(a) $3 d^{4} 4 s^{2}$ (b) $3 d^{5} 4 s^{1}$

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Solution

Second electronic configuration is more stable than the first one. This is because it is half filled and thus symmetrical.
When orbitals are half-filled or fully filled, then the electronic configuration becomes more stable.
Accordning half-filled electronic configuration.
$3 d^{5} 4 s^{1}$ is more stable then $3 d^{4} 4 s^{2}$ .

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