| 单词 | alkaline earth metal |
| 释义 | > as lemmasalkaline earth metal alkaline earth metal n. Chemistry each of the elements beryllium, magnesium, calcium, strontium, barium, and radium, occupying Group 2 of the periodic table, which are reactive, electropositive, divalent metals forming basic oxides which react with water to form comparatively insoluble hydroxides. ΚΠ 1808 H. Davy in Philos. Trans. (Royal Soc.) 98 346 I shall venture to denominate the metals from the alkaline earths barium, strontium, calcium, and magnium [sc. magnesium].] 1854 F. A. Abel & C. L. Bloxam Hand-bk. Chem. 604 Small quantities of the oxalates and borates of the alkaline earths, and of the fluorides of the alkaline-earth-metals may also be obtained in the precipitate. 1910 A. J. Walker & O. E. Mott tr. A. F. Holleman Text-bk. Org. Chem. (ed. 3) 348 Carbon disulphide..With alkali-metal or alkaline-earth-metal sulphides it yields trithiocarbonates. 1955 J. C. Giblin Qualitative & Volumetric Anal. (ed. 2) i. 5 White, fusible, residue indicates Alkali or Alkaline earth metal. 2001 O. Sacks Uncle Tungsten xvi. 189 The same melody..was played in each period—first an alkali metal, then an alkaline earth metal, then six more elements, each with its own valency or tone. < as lemmas |
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