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Molecules and Atomicity

Assertion: El...

Question

Assertion: Element with three shells is kept in the third period.

Reason: The number of shells in an element is equal to the period number in which it is kept.

A

Both assertion and reason are true and the reason is the correct explanation for the assertion.

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B

Both assertion and reason are true but the reason is not the correct explanation for the assertion.

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C

The assertion is true but the reason is false.

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D

The assertion is false but the reason is true.

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Solution

The correct option is A Both assertion and reason are true and the reason is the correct explanation for the assertion.
The number of shells in the atom of an element indicates the period in which it will be kept. The number of shells of an element is equal to the period number in which the element is kept. Therefore, elements with three shells will be kept in the third period. So, the reason is the correct explanation for the assertion given to us.

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