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14th of March 2017
Chemistry
Q:

In group 1 of periodic table , 3 elements A,B and C have atomic radii 95 pm,133 pm and 65 pm respectively.Giving a reason, arrange them in increasing order of their atomic nos of the group.Explain?

Vikas Mahajan - CBSE - Class XI Science

Tuesday, March 14, 2017 at 17:57:PM

A:

C < A < B

As we move down the group, the number of shells increases.

This effect of having an extra shell of electrons outweighs the effect of increased nuclear charge.

Hence the atomic size increases.

Tuesday, March 14, 2017 at 18:05:PM