Assertion :The maximum number of electrons in the shell with principle quantum number n is equal to $2 n^{2}$ . Reason: Two electrons can have the same value of theree quantum numbers n, l and m, but must have the opposite spin quantum number.

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
In $n^{t h}$ shell, the total number of orbitals are $n^{2}$ where each orbital can occupy a maximum of two electrons with opposite spin quantum number as +1/2 and -1/2. Rest of the three quantum numbers in a given orbital will be same.
Thus it will follow Pauli's exclusion principle.
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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