- In the case of aluminium iodide an ionic bond with much covalent character is present.
- "' Aluminium iodide "'is any chemical compound containing only aluminium and iodine.
- Protactinium iodides result from the oxides and aluminium iodide or ammonium iodide heated to 600 癈 . Protactinium ( III ) iodide was obtained by heating protactinium ( V ) iodide in vacuum.
- Thus sodium chloride ( with a low positive charge ( + 1 ), a fairly large cation ( ~ 1 ?) and relatively small anion ( 0.2 ?) is ionic; but aluminium iodide ( AlI 3 ) ( with a high positive charge ( + 3 ) and a large anion ) is covalent.