| 单词 | valence shell |
| 释义 | > as lemmasvalence shell valence shell n. the outer shell (shell n. 19b) of an atom, incompleteness of which is responsible for its valency. ΘΚΠ the world > matter > chemistry > valency > [noun] > valence shell valence shell1923 1923 G. N. Lewis Valence iv. 57 The valence shell of a free (uncombined) atom never contains more than eight electrons. 1972 R. A. Jackson Mechanism v. 99 Boron compounds are unusual (in relation to most organic compounds) in having an empty valence-shell orbital. < as lemmas |
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