| 单词 | ruthenium |
| 释义 | ruthenium /rooh thee"nee euhm, -theen"yeuhm/, n. Chem. a steel-gray, rare metallic element, belonging to the platinum group of metals. Symbol: Ru; at. wt.: 101.07; at. no.: 44; sp. gr.: 12.2 at 20°C. [1840-50; < NL, named after RUTHENIA (from the fact that it was first found in ore from the region); see -IUM] |
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