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

Question

Quizplus · Accepted Answer

In group I, Iodine (I) has the largest atomic radius due to the increase in number of shells. Therefore, Rb has a smaller atomic radius than Iodine. 
In group II, Antimony (Sb) has the smallest atomic radius due to the increased nuclear charge pulling the electrons closer to the nucleus, compared to As and N which have more electrons shielding the nuclear charge. Therefore, the answer is Te;Sb or choice C.

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