Chromium exhibit 4s1 3d5 electronic configuration instead of 4s2 … - Vidyadip

Question

Chromium exhibit $4s1 \ 3d5$ electronic configuration instead of $4s2 \ 3d4.$ Explain.

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Answer

Completely filled or half$-$filled subshells are highly stable.
In $4s^1 3d^5$ configuration, both s and d subshells are half$-$filled.
Thus, due to the extra stability associated with half$-$filled subshells, chromium exhibits $4s^1 3d^5$ electronic configuration instead of $4s^2 3d^4.$

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