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  3. Chemistry
  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 :

JEE MainJEE Main 2013Classification of Elements and Periodicity in Properties

Solution:

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.,$O < S < Se < As$