The electronic configuration of chromium (Cr, | vedclass

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Question

(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 $d$-orbitals $(d^5)$ are more stable due to exchange energy and symmetry. Therefore,one electron from the $4s$ orbital jumps to the $3d$ orbital to achieve the stable $[Ar] 3d^5 4s^1$ configuration.

The electronic configuration of chromium ($Cr$,$Z=24$) is:

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