size variation

Asked by  | 18th May, 2008, 04:35: PM

Expert Answer:

when an electron is added on in group it is added on to new shell whereas in period it is added to the same shell , so as we go down the group the size increases but along the period it decreases due to  increase in effective nuclear charge.

Answered by  | 19th May, 2008, 06:25: PM

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