(a)How and (b)why do atomic radii of elements change as we move (1)from left to right in a period (2)down a group in the periodic table

Asked by Mythrayee Balasubramanian | 19th Feb, 2012, 11:01: AM

Expert Answer:

It is a fundamental phenona. When we move from left to right in a period, at each step one more electron is being added to the atom. So, the atomic radii increases.
Similarly, when we move down the group. due to the incoming 8, 18 or 32 electrons, the atomic radius increases. 

Answered by  | 19th Feb, 2012, 01:44: PM

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