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What is a hydrogen bond?
A hydrogen bond is a special type of attractive interaction (perhaps a variation of a dipole-dipole bond) that exists between an electronegative atom and a hydrogen atom bonded to another electronegative atom. This type of bond always involves a hydrogen atom, thus the name. Hydrogen bonds can occur between molecules (intermolecular) or within different parts of a single molecule (intramolecularly). The typical hydrogen bond is stronger than van-der-Waals forces, but weaker than covalent or ionic bonds.
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