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Question

Assertion :Two electrons in Helium are placed in only one shell while three electrons in Lithium occupy two shells. Reason: An orbit can have maximum 2n2 of electron so first orbital can have two electron only.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
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C
Assertion is correct but Reason is incorrect.
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D
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.
An orbit can have maximum 2n2 of electron so first orbital can have two electron only. Because of this reason Li's third electron will go to second orbit and have configuration of 2, 1.

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