Final answer:
Cesium (Cs) and Barium (Ba) cations would form iodides with the cesium chloride structure.
Step-by-step explanation:
The cations in the table that would form iodides (compounds with iodine, I) having the cesium chloride (CsCl) structure are Cs (Cesium) and Ba (Barium). These cations are both in group 1 and have similar sizes, which allows them to form a simple cubic structure with iodide ions.