Question

what is meant by atomic radius ? explain why does it decreases across a period? ​

Answer 1

ATOMIC RADIUS : It is the distance between the centre of the nucleus to the outer most shell.

It decreases across a period because due to the increase in the number of protons and electrons across a period.One proton has a greater effect than one electron;thus, electrons are pulled towards the nucleus, resulting in a smaller radius..

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