Assertion :The electronic configuration of chromium violates Aufbau's principle. Reason: Half filled configuration is associated with greater stability.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
$_{24} C r = [A r] 4 s^{1} 3 d^{5}$ which violates Aufbau principle as elctrons enters in $3 d$ before fully filling $4 s$ as Half filled $3 d$ and $4 s$ orbitals are more stable the partially filled orbitals.

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