Which of the following is the correct electro | vedclass

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

Vedclass · Accepted Answer

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

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(C) 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 $d$-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 $Cr$?

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