How does a hydrogen bond form?
A hydrogen bond is a directional attraction between hydrogen bonded to an electronegative atom and a nearby electron-rich atom.
Molecular process and core principles
Oxygen, nitrogen or fluorine draws bonding electrons and leaves hydrogen partly positive. The interaction is weaker than a covalent bond but important in large numbers.
Evidence, applications and limits
Water's boiling point, DNA base pairing and protein folding relate to these bonds. Strength varies with geometry, solvent and temperature. Comparisons can be misleading unless temperature, pressure, concentration and sample purity are stated.
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