Which of the following electronic configurati | vedclass

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(C) The electronic configuration of $K$ $(Z=19)$ is $[Ar]4s^1$. For $Cr$ $(Z=24)$,the stable configuration is $[Ar]3d^54s^1$ due to the extra stabilit

Vedclass · Accepted Answer

$K = [Ar]4s^1, Cr = [Ar]3d^54s^1, Cu = [Ar]3d^{10}4s^1$

Vedclass · Answer

(C) The electronic configuration of $K$ $(Z=19)$ is $[Ar]4s^1$. For $Cr$ $(Z=24)$,the stable configuration is $[Ar]3d^54s^1$ due to the extra stability of half-filled $d$-orbitals. For $Cu$ $(Z=29)$,the stable configuration is $[Ar]3d^{10}4s^1$ due to the extra stability of fully-filled $d$-orbitals. Therefore,the correct configuration is $K = [Ar]4s^1, Cr = [Ar]3d^54s^1, Cu = [Ar]3d^{10}4s^1$.

Which of the following electronic configurations is correct?

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