Question

which group has the largest atomic radii in its respective period ​

Answer 1

the groups present to the left side have largest atomic radii

Answer 2

Atomic radii vary in a predictable way across the periodic table. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest.