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Assertion :At...

Question

Assertion :Atomic size decreases as we move from left to right in a period. Reason: In a period from left to right the number of valence electrons in the same shell increases.

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

Assertion is incorrect but Reason is correct

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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 a period from left to right the number of valence electrons in the same shell increases due to which the effective nuclear charge increases and therefore atomic size decreases as we move from left to right in a period.

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