Valence or Valency
Valence or Valency : A number representing the combining power of at atom, i.e. the number of electrons lost, gained, or shared by an atom in a compound. It is also a measure of the number of hydrogen atoms with which an atom will combine or replace, e.g., an oxygen atom combines with two hydrogens, hence has a valence of 2. Thus, there are mono-, tri-, etc., valent ions. (Bul D11)
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