Chemistry

Question Analysis
This question involves comparing atomic radii of elements in the same group of the periodic table. The main focus is on the trend of atomic radius down a group.

Key Concept Explanation
Atomic radius increases down a group because each subsequent element has an additional electron shell, increasing the distance between the nucleus and the outermost electrons.

Step-by-Step Solution
1. Identify the group: F, Cl, Br, I are all in Group 17 (halogens).
2. Apply the group trend: Atomic radius increases from top to bottom in a group.
3. Locate positions: Iodine is the lowest el...