The major type of interactive forces between molecules of NH_3 are: ionic covalent hydrogen bonding dipole-dipole attractions dispersion forces Solution Answer 18: The major type of interactive force that lie between molecule of ammonia (NH3) are covalent bond. The single Nitrogen atom in an ammonia molecule is bonded to three atoms of Hydrogen through the sharing of three electron pairs, one with each atom of Hydrogen. Thus, finally said that the ammonia molecule is formed by covalent bonding between one Nitrogen atom and three Hydrogen atoms..