Question

give reason atomic radius goes on decreasing while going from left to right in a period

Answer 1

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Here is your answer

Atomic radius goes on decreasing from left to right and it is measured as the distance from the nucleus to outer most shell of an electron

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Answer 2

the no. of electrons gets added one by one in the outer most shell while going from left to right in a period.hence, the nuclear force exerted by the nucleus on the electrons increase.as a result, electrons are held closer to the nucleus,thereby decreasing the atomic radius.