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Which electronic configuration is not possible?

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$2 p^{6}$

$2 d^{5}$

$1 s^{3}$

$4 d^{12}$

answer is Ŋ.

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Detailed Solution

$1 S^{3}$ is not possible because S-orbital can accommodate a maximum of 2 electrons only

$2 d^{5}$ don’t exist, because the minimum $n^{0}$ value that permits d-orbital to exits is 3

$4 d^{12}$ is not possible, because d-subshell can accommodate a maximum of 10 electrons only

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