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Question
The order of increasing sizes of atomic radii among the elements O, S, Se and As is:
Options
As < S < O < Se
Se < S < As < O
O < S < As < Se
O < S < Se < As
MCQ
Solution
O < S < Se < As
Explanation:
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
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