Assertion :The ground state of configuration of $C r$ is $3 d^{5} 4 s^{1}$ . Reason: A set of half-filled orbitals containing one electrons each with their spin parallel provides extra 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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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The ground state of configuration of $C r$ is $3 d^{5} 4 s^{1}$ and this is because set of half-filled orbitals containing one electrons each with their spin parallel provides extra stability.

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