On moving down in a group atomic radii increases due to successive addition of extra shell hence O<S< Se Further As is in group 15 having one less electron in its p orbital hence have higher atomic radii than group 16 elements. i.e., O<S<Se<As
The order of increasing sizes of atomic radii among the elements O, S, Se and As is :
Held on 22 Apr 2013 · Verified 6 Jul 2026.
As <S<O<Se
Se<S<As<O
O < S < As <Se
O<S<Se<As
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