The hydrogen atom has unusual but important properties (Sections 5.6–5.7) that are central to much of chemistry. The asymmetry of the hydrogen bond arises from the repulsion between the donor and acceptor anions (Section 5.2). This constraint determines the geometry of the normal hydrogen bond (Section 5.3) and indicates where shorter (Section 5.4) or longer (Section 5.5) hydrogen bonds will be found. A variety of techniques is available for determining hydrogen bond valences from the bond lengths (Section 5.8).
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