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 groupN,O,F,Ne.....2nd periodCl....3rd  periodIncreasing 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.