#valence  (chemistry) a property of atoms or radicals; their combining power given in terms of the number of hydrogen atoms (or the equivalent)
  supertype:  powerfulness__power__potency  possession of controlling influence; "the deterrent power of nuclear weapons"; "the power of his love saved her"
  subtype:  covalence__covalency  valence characterized by the sharing of electrons in a chemical compound; the number of pairs of electrons an atom can share

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