Question

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

विकल्प

• As < S < O < Se

• Se < S < As < O

• O < S < As < Se

• O < S < Se < As

Answer 1

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