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

increases

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decreases

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does not change

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none of these

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Solution

The correct option is B decreases
As we move towards, the right, electrons are added in the same shell. As a result the effective nuclear charge increases as electrons of same shell do not shield each other. Hence they are heavily attracted towards the center. Thus the atomic size decreases. Hence when we move towards right, the atomic size decreases.

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Similar questions

(a) How does the size of atoms (atomic size) generally vary in going from left to right in a period of the periodic table? Why does it vary this way?

(b) What happens to the metallic character of the elements as we move from left to right in a period of the periodic table?

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