Answer:K > Ge > Br > S > Cl
We expect the radius of Cl to be smaller than that of Br which is in Group 7A.
S in Period 3 should be smaller than Br in Period 4.
Cl will be smaller than S, as size decreases across a period.
Of the period 4 atoms, Ge is earlier in the period than Br and therefore larger, but smaller than K which starts the period.