What does a hydrogen atom need to be in for hydrogen bonding to occur?

For hydrogen bonding to occur, a hydrogen atom must be covalently bonded to a highly electronegative atom, such as oxygen, nitrogen, or fluorine. This creates a significant dipole moment, where the hydrogen atom carries a partial positive charge. The positively charged hydrogen can then interact with the lone pair of electrons on another electronegative atom, forming a hydrogen bond. This type of interaction is crucial in stabilizing the structures of various biological molecules, such as proteins and nucleic acids.