Which of the following is the correct electro | vedclass

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(A) The atomic number of $Cr$ (Chromium) is $24$.According to the Aufbau principle,the expected configuration is $[Ar] 4s^2 3d^4$.However,half-filled

Vedclass · Accepted Answer

$1s^2 2s^2 2p^6 3s^2 3p^6 4s^1 3d^5$

Vedclass · Answer

(A) The atomic number of $Cr$ (Chromium) is $24$.According to the Aufbau principle,the expected configuration is $[Ar] 4s^2 3d^4$.However,half-filled and fully-filled $d$-orbitals are more stable due to exchange energy and symmetry.Therefore,one electron from the $4s$ orbital jumps to the $3d$ orbital to make the $d$-subshell half-filled $(3d^5)$.The correct electronic configuration is $[Ar] 4s^1 3d^5$,which is $1s^2 2s^2 2p^6 3s^2 3p^6 4s^1 3d^5$.

Which of the following is the correct electronic configuration of $Cr$ (Chromium)?

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