In an ionic compound, the electrostatic attraction between the positively and negatively charged ions holds the compound together. In NH4Br, the ammonium ion donates an electron to the bromide ion, resulting in a net positive charge on the ammonium ion and a net negative charge on the bromide ion. These ions are then attracted to each other to form an ionic bond.
The strength of the ionic bond in NH4Br is influenced by several factors, such as the charge of the ions, the size of the ions, and the lattice energy. In general, ionic bonds are stronger than covalent bonds and are characterized by high melting and boiling points, as well as good electrical conductivity in the molten or dissolved state.
