HF has one hydrogen bond. Hydrogen bonding occurs when a hydrogen atom covalently bonded to a highly electronegative atom (such as N, O, or F) interacts with another electronegative atom. In the case of HF, the hydrogen atom is bonded to fluorine, which is highly electronegative. This creates a strong dipole moment, with the hydrogen end of the molecule being partially positive and the fluorine end being partially negative. The positive end of the hydrogen atom can then interact with the negative end of another electronegative atom, forming a hydrogen bond.