Which of the following is the correct electro | vedclass

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

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$[Ar] 3d^5 4s^1$

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

Which of the following is the correct electronic configuration of $Cr$ $(Z=24)$?

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