The electronic configuration of the element w | vedclass

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(D) The atomic number of the element is $24$ (Chromium).According to the Aufbau principle,the expected configuration is $1s^2 2s^2 2p^6 3s^2 3p^6 3d^4

Vedclass · Accepted Answer

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

Vedclass · Answer

(D) The atomic number of the element is $24$ (Chromium).According to the Aufbau principle,the expected configuration is $1s^2 2s^2 2p^6 3s^2 3p^6 3d^4 4s^2$.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.The correct electronic configuration is $1s^2 2s^2 2p^6 3s^2 3p^6 3d^5 4s^1$.

The electronic configuration of the element with atomic number $24$ is:

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