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  4. The order of increasing sizes of atomic radii among the elements O, S, Se and As is :

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Q. The order of increasing sizes of atomic radii among the elements O, S, Se and As is :

NTA AbhyasNTA Abhyas 2022

Solution:

On moving down in a group atomic radius 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