<P> Ion - dipole and ion - induced dipole forces are similar to dipole - dipole and dipole - induced dipole interactions but involve ions, instead of only polar and non-polar molecules . Ion - dipole and ion - induced dipole forces are stronger than dipole - dipole interactions because the charge of any ion is much greater than the charge of a dipole moment . Ion - dipole bonding is stronger than hydrogen bonding . </P> <P> An ion--dipole force consists of an ion and a polar molecule interacting . They align so that the positive and negative groups are next to one another, allowing maximum attraction . </P> <P> An ion - induced dipole force consists of an ion and a non-polar molecule interacting . Like a dipole - induced dipole force, the charge of the ion causes distortion of the electron cloud on the non-polar molecule . </P> <P> A hydrogen bond is the attraction between the lone pair of an electronegative atom and a hydrogen atom that is bonded to either nitrogen, oxygen, or fluorine . The hydrogen bond is often described as a strong electrostatic dipole - dipole interaction . However, it also has some features of covalent bonding: it is directional, stronger than a van der Waals force interaction, produces interatomic distances shorter than the sum of van der Waals radius, and usually involves a limited number of interaction partners, which can be interpreted as a kind of valence . </P>

Describe the relationship of attractive forces between molecules