The atomic radius decreases in a period due
to

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Increase in number of electrons

Decrease in number of electrons

Decrease in nuclear attraction

Increase in nuclear attraction

answer is A.

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Detailed Solution

We know that as we move along a period from left to right , the effective nuclear charge increases.

And, Atomic radius decreases with increase in Z-effective. More the Z-effective nuclear charge, the more the attraction from the nucleus, less the size.

Hence, Option(a) is the answer.

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