Here's why:
* Atomic Radius: Atomic radius refers to the distance from the nucleus to the outermost electron shell of an atom. As you move down a group (column) in the periodic table, atomic radius increases. This is because you are adding more electron shells.
* Location on the Periodic Table:
* Fluorine (F) and Chlorine (Cl) are in Group 17 (halogens).
* Bromine (Br) and Iodine (I) are also in Group 17.
* Iodine is located below bromine in the same group.
Therefore, iodine has the largest atomic radius and is the largest atom among the four.
