which element will have the smallest atomic radius? xenon (xe) krypton (kr) argon (ar) neon (ne)

Explanation:

Step1: Recall atomic - radius trend

Atomic radius decreases across a period and increases down a group.

Step2: Analyze given elements

Neon (Ne) is in period 2, argon (Ar) in period 3, krypton (Kr) in period 4 and xenon (Xe) in period 5.

Answer:

neon (Ne)