Assertion :Among 4s and 3d subshells, 4s subshell is filled with electrons first. Reason: Both the subshells possess equal (n + 1) values.

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 C Assertion is correct but Reason is incorrect
Both the subshells haven't equal(n+l) Value, In 4s (n+l)= 4+0 and in 3d (n+l)= 3+2
According to Aufbau principle, subshell with lower energy fills first. Thus 4s subshell will be filled first.

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