Question

order the elements s, cl, and f in terms of increasing atomic radii. s, f, cl f, cl, s cl, f, s s, cl, f f, s, cl

Explanation:

Atomic radius increases down a group (due to more electron shells) and decreases across a period (due to increased nuclear charge attracting electrons closer). F is in period 2, Cl in period 3 (so Cl > F). S and Cl are in the same period (period 3), and since atomic radius decreases across a period (S is to the left of Cl), S > Cl.

Answer:

F, Cl, S