| 单词 | alkali metal |
| 释义 | > as lemmasalkali metal alkali metal n. Chemistry each of the metallic elements lithium, sodium, potassium, rubidium, caesium, and francium, occupying group 1 of the periodic table, which are very reactive and form strongly alkaline hydroxides. ΚΠ 1843 J. L. Bullock tr. C. R. Fresenius Elem. Instr. Chem. Anal. iii. 258 The sulpherets [sic] of the alkali metals. 1900 Philos. Trans. (Royal Soc.) A. 193 89 The colour imparted to flames by the salts of an alkali metal is generally considered to be due to the metal existing in the state of incandescent vapour. 1950 N. V. Sidgwick Chem. Elements I. 11 Hydrogen..has close affinities both with the alkali metals of Group I and with the halogens of Group VII. 2001 O. Sacks Uncle Tungsten xvii. 217 Bunsen and Kirchhoff discovered another new alkali metal; they called this rubidium, from ‘the magnificent dark red color of its rays’. < as lemmas |
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