Which atom in each group (I and II)has the smallest atomic radius?
(I)Sr,Zr,I (II)N,P,As
A)Sr;N
B)Sr;As
C)I;N
D)I;As

Question

Quizplus · Accepted Answer

In group I, as we move from left (Sr) to right (I), the atomic radius decreases due to increase in the number of protons and electrons but no corresponding increase in the shielding effect. Therefore, I has the smallest atomic radius in group I. In group II, as we move from top (N) to bottom (As), the atomic radius increases due to increase in the number of energy levels. Therefore, N has the smallest atomic radius in group II.

Which Atom in Each Group (I and II)has the Smallest