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

Question

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

Tardigrade Admin · Accepted Answer

On moving down in a group atomic radii increases due to successive addition of extra shell hence

O < S < S e

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 < S e < A s

Q. The order of increasing sizes of atomic radii among the elements $O, S, S e$ and $A s$ is :

$A s < S < O < S e$

$S e < S < A s < O$

$O < S < A s < S e$

$O < S < S e < A s$

On moving down in a group atomic radii increases due to successive addition of extra shell hence
$O < S < S e$
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., $O < S < S e < A s$

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

As<S<O<Se

Se<S<As<O

O<S<As<Se

O<S<Se<As