Question

____ has the smallest atomic radius.
a tin.
b germanium
c silicon
d lead

Explanation:

Atomic radius increases down a group in the periodic table. Tin (Sn), Germanium (Ge), Silicon (Si), and Lead (Pb) are all in Group 14. Silicon is the highest - up in the group among these elements, so it has the smallest atomic radius due to having fewer electron shells compared to the others.

Answer:

C. Silicon