* Boron (B) is a metalloid in group 13, and it typically forms a +3 cation (B³⁺).
* Iodine (I) is a halogen in group 17, and it typically forms a -1 anion (I⁻).
To achieve a neutral ionic compound, you need three iodine ions (3 x -1 = -3) to balance the +3 charge of the boron ion.
