18. which element would have the smallest radius?

18. which element would have the smallest radius?
Answer
Explanation:
Step1: Recall atomic - radius trend
Atomic radius decreases across a period (from left - to - right) and increases down a group (from top - to - bottom) in the periodic table.
Step2: Analyze given elements
Among the elements shown, we need to find the one in the upper - right position in the periodic table.
Answer:
Ne