Hydrogen bonding is a type of electro-attractive force between hydrogen (that is contently bonded to a electromotive atom – yielding the presence of a slight positive charge) and another the electron-pair on an electronegative atom on a separate molecule.
The disparity in charge creates an attraction between hydrogen and the other electronegative atom (usually nitrogen, oxygen, or flourine). Hydrogen bonds are strong forces than van der Waals interactions, but much weaker than covalent or ionic bonds.
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