The  radius of O, N, Cl, F and Ne increase in the order

Atomic radius decreases from left to right in a period and increases down the group
N,O,F,Ne.....2^nd period
Cl....3^rd  period
Increasing order of  radius is F,O,N,Cl, Ne.
Note : In case of "Ne" we need to consider vanderwaals radii where as in case of F,O,N ,Cl we need to consider covalent radii.