What is the electronic configuration of 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

Vedclass · Accepted Answer

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

Vedclass · Answer

(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 are more stable due to exchange energy and symmetry. Therefore,one electron from the $4s$ orbital shifts to the $3d$ orbital,resulting in the stable configuration $[Ar] 3d^5 4s^1$. Thus,the correct option is $B$.

What is the electronic configuration of $Cr$?

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