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

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

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

A.            As < S < O < Se

B.            Se < S < As < O

C.            O < S < As < Se

D.            O < S < Se < As

Answer: O < S < As < Se

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