| 释义 |
tetravalent, a. Chem.|tɪˈtrævələnt, tɛtrəˈveɪlənt|
[f. Gr. τετρα- tetra- + L. valēnt-em, pr. pple. of valēre to be worth.]
Combining with four atoms of hydrogen or other monovalent element, or with four monovalent radicals, or capable of replacing four atoms of monovalent elements in a compound; thus the atoms of carbon and of lead are tetravalent in the compounds CH4, Pb(C2H5)4; = quadrivalent a. 1. So tetravalence, the quality or fact of being tetravalent; quadrivalence; also tetraˈvalency.
1868Williamson Chem. for Students 124 Oxygen is..called a divalent element. A similar reasoning shows nitrogen to be trivalent; and carbon is tetravalent. 1887Athenæum 13 Aug. 217/1 Proof is thus afforded that these elements [sulphur and selenium] are at least tetravalent in function. 1887Trans. R. Soc. Edin. XXXII. 456 The tetravalence of Carbon unsatiated by the bivalence of Oxygen. 1913Phil. Mag. XXVI. 495 The observed trivalency and tetravalency respectively of these elements. 1976Sci. Amer. Dec. 33/1 In the solvents that were used..tetravalent plutonium ions, Pu4+ (plutonium atoms from which four electrons have been removed), are soluble. 1982Nature 25 Nov. 386/1 Organic chemistry, thanks to the tetravalency of carbon and the stability of its incestuous bonds, is responsible for most of the compounds. |