| 单词 | valence bond |
| 释义 | > as lemmasvalence bond valence bond n. originally, a chemical bond thought of in terms of atomic valencies; in modern use, one described in terms of individual valence electrons rather than molecular orbitals; frequently attributive. ΘΚΠ the world > matter > chemistry > chemical bonding > [noun] > covalent bonding > valence bond valence bond1913 the world > matter > chemistry > chemical bonding > [adjective] > of or relating to covalent bonding > of or relating to a valence bond valence bond1913 1913 Jrnl. Amer. Chem. Soc. 35 1443 This view leads to the grouping of substances into two general classes, according as the valence bonds are chiefly polar or non-polar in nature. 1931 Physical Rev. 37 481 This is a homopolar valence bond, and the two electrons forming such a bond are inactive in forming further bonds, just as if they were in closed shells within a single atom. 1965 C. S. G. Phillips & R. J. P. Williams Inorg. Chem. I. iii. 67 The problem will be introduced by a summary of the two important wave-mechanical approximation methods, the L.C.A.O. (linear combination of atomic orbitals) molecular-orbital method and the valence-bond method. 1978 P. W. Atkins Physical Chem. xv. 493 Just as in m.o. theory, the strength of the bond according to valence-bond theory can be traced in large part to the effects of the accumulation of electron density in the bonding region between the two nuclei. < as lemmas |
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