JEE Main2013ChemistryClassification of Elements and Periodicity in PropertiesActual
The order of increasing sizes of atomic radii among the elements O, S , Se and As is :
Options
- AAs < S < O < Se
- BSe < S < As < O
- CO < S < As < Se
- DO < S < Se < As
Correct answer
C. O < S < As < Se
Step-by-step 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