Which substance has ionic bonds LiI H2O NH3 Br2 Which substance has ionic bonds LiI H2O NH3 Br2 Which substance has ionic bonds LiI H2O NH3 Br2 Solution There are two different ways to determine whether the bond is ionic or not. They are 1. If a compound is made of a metal atom and a non-metal atom, then the bonding will be ionic 2. And it can also be decided from the electronegativity difference between the two atoms of a molecule. If the electronegativity difference is over or close to 1.7 (this value varies in literature from 1.6-2.1), then the bond between the atom might be ionic..