Answer:
nitrogen (N)
Nitrogen (N) is the smallest atom in Group 5A because it has the smallest atomic radius compared to the other elements in the group, such as phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi). Atomic radius generally increases as you move down a group on the periodic table due to the addition of more energy levels or electron shells. Therefore, nitrogen, being the topmost element in Group 5A, has the smallest atomic radius.
