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While moving down in a periodic table the atomic radius keeps on increasing and moving left to right will show a decreasing trend in atomic radius. Arsenic and Selenium are in the lowermost row but arsenic is more to the left. Therefore, As has the largest atomic radius.
Among S, Se, P, and As, Se element will have the largest atomic radius because Se is in period 4, while S is in period 3, P is in period 3, and As is in period 4 and the estimated radii of Se is 117 pm, As is 114 pm, S is 100 pm, and P is 100 pm. As is in group 15, while Se is in group 16. Atomic radius generally increases from group 15 to group 16 due to the addition of extra energy level.