(C) The electronic configuration of $Cr$ $(Z=24)$ is $[Ar] \, 3d^5 \, 4s^1$.In this configuration,there are $5$ unpaired electrons in the $3d$ subshel

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If the Assertion is correct but Reason is incorrect.

(C) The electronic configuration of $Cr$ $(Z=24)$ is $[Ar] \, 3d^5 \, 4s^1$.In this configuration,there are $5$ unpaired electrons in the $3d$ subshell and $1$ unpaired electron in the $4s$ subshell,totaling $6$ unpaired electrons.The stability of the $Cr$ atom is due to the half-filled $d$ subshell $(3d^5)$,not the $s$ orbital.Therefore,the Assertion is correct,but the Reason is incorrect.

Class 12 Chemistry d-and f-Block Elements General Characteristics

Easy

Assertion : The free gaseous $Cr$ atom has six unpaired electrons.
Reason : Half-filled $s$ orbital has greater stability.

AIIMS 2004 All AIIMS

A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
C
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.