quadrivalencen.
/ˌkwɒdrᵻˈveɪləns/, /ˌkwɒdrɪˈveɪln̩s/, U.S. /ˌkwɑdrəˈveɪl(ə)ns/ Chemistry.
= tetravalence n. at tetravalent adj. Derivatives.
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the world > matter > chemistry > valency > [noun] > valency of four > quality of being quadrivalent
quadrivalence1869
tetravalence1887
tetravalency1913
1869 R. Bridges Fownes's Man. Elem. Chem. 272 Lead stands by itself. Its quadrivalence is inferred from the composition of plumbo-tetrethide.
1904 Jrnl. Amer. Chem. Soc. 26 925 Thorium... Nilson..determined its atomic weight and secured unquestionable evidence as to its quadrivalence.
1985 Internat. Jrnl. Nuclear Med. & Biol. 12 115 It was presumed that hard acids of trivalence, quadrivalence and pentavalence would replace Ca in the Ca salts of hard bases.
This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022).
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