* Atomic Radius Trend: Atomic radius increases as you move down a group (column) on the periodic table. This is because you're adding more electron shells, increasing the distance between the nucleus and the outermost electrons.

* The Elements: Fluorine, chlorine, and bromine are all in Group 17 (halogens). They are arranged in order of increasing atomic number: fluorine (F), chlorine (Cl), bromine (Br).

Therefore, bromine (Br) has the largest atomic radius because it is located furthest down the group.