valency

Noun
  1. The phenomenon of forming chemical bonds (synset 111456605)
  2. (biology) a relative capacity to unite or react or interact as with antigens or a biological substrate (synset 105042144)
  3. (chemistry) a property of atoms or radicals;
    Their combining power given in terms of the number of hydrogen atoms (or the equivalent) (synset 105041628)

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