The electronic configurations of Cr^{24} and | vedclass

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Question

(A) Expected electronic configuration:$24 \ Cr : [Ar] 3d^4 4s^2$$29 \ Cu : [Ar] 3d^9 4s^2$Observed electronic configuration:$24 \ Cr : [Ar] 3d^5 4s^1$

Vedclass · Accepted Answer

Due to extra stability of exactly half-filled and exactly fully-filled subshells.

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(A) Expected electronic configuration:$24 \ Cr : [Ar] 3d^4 4s^2$$29 \ Cu : [Ar] 3d^9 4s^2$Observed electronic configuration:$24 \ Cr : [Ar] 3d^5 4s^1$$29 \ Cu : [Ar] 3d^{10} 4s^1$Due to the extra stability of half-filled and fully-filled subshells,one electron from the $4s$ orbital jumps to the $3d$ orbital. Therefore,chromium and copper show abnormal electronic configurations.

The electronic configurations of $Cr^{24}$ and $Cu^{29}$ are abnormal.

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