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Anomalous Behaviour of Fluorine

Assertion :Tw...

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 $2 n^{2}$ of electron so first orbital can have two electron only.

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.
An orbit can have maximum $2 n^{2}$ 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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