Question

O, C, F,Cl,Br arrange in the increaseing order of atomic radii

Answer 1

the correct increasing order is F,O,C Cl ,Br...
hope this helps

Answer 2

The correct order would be :

F < O < C <  Cl < Br

Note the following :

⇒ The atomic radii increases down a group .

⇒ The radii increases left across the period .

Hence F < O < C < Cl < Br

This is for the reasons stated above.