As we move from left to right in a period, the atomic size__________.

decreases

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increases

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constant

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none of these

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Solution

The correct option is A decreases
As we move towards right along a period, the electrons are added to same shell and as a result , the effective nuclear charge increases. Thus the electrons experience greater force and thus are pulled towards center. Thus the atomic size decreases. Hence correct answer is option A-decreases.

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Similar questions

Assertion: The atomic radius decreases as we move from left to right in a period.

Reason: Effective nuclear charge increases across the period from left to right.

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