1.

Which of the following pairs of elements have similar atpmic radii?A. `P, S`B. `As, Se`C. `N, O`D. `Sb, Te`

Answer» Correct Answer - C
Though one expects `O` to be smaller than `N`, but in case of `O`, the interelectronic repulsion outweights the effect of increased nuclear charge and hence, both `N` and `O` have similar convalent radii. The effect of interelectronic repulsions dies out on moving down the group due to increased nuclear charge.


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