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Quadrivalence
Quadrivalence Quad*riv"a*lence, n. (Chem.)
The quality or state of being quadrivalent; tetravalence.
QuadrivalentQuadrivalent Quad*riv"a*lent, a. [Quadri- + L. valens, -entis,
p. pr. See Valence.] (Chem.)
Having a valence of four; capable of combining with, being
replaced by, or compared with, four monad atoms; tetravalent;
-- said of certain atoms and radicals; thus, carbon and
silicon are quadrivalent elements. Trivalence
Trivalence Triv"a*lence, n. (Chem.)
The quality or state of being trivalent.
TrivalentTrivalent Triv"a*lent, a. [Pref. tri- + L. valens, -entis, p.
pr. See Valence.] (Chem.)
Having a valence of three; capable of being combined with,
substituted for, or compared with, three atoms of hydrogen;
-- said of triad atoms or radicals; thus, nitrogen is
trivalent in ammonia.
Meaning of Rivalen from wikipedia
