Assertion :The maximum number of electrons allowed in the third principal energy level is 18 Reason: The maximum number of electrons allowed in a principal energy level is dictated by the equation $2 n^{2}$

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
Assertion
The maximum number of electrons allowed in the third principal energy level is 18
Reason
The maximum number of electrons allowed in a principal energy level is dictated by the equation $2 n^{2}$
Here n is the number of the energy level.
For third principal energy level, n is 3.
$2 n^{2} = 2 \times 3^{2} = 18$
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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