| 释义 |
WordReference Random House Unabridged Dictionary of American English © 2024ru•the•ni•um (ro̅o̅ thē′nē əm, -thēn′yəm),USA pronunciation n. [Chem.]- Chemistrya 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.
- Neo-Latin, named after Ruthenia (from the fact that it was first found in ore from the region); see -ium
- 1840–50
Collins Concise English Dictionary © HarperCollins Publishers:: ruthenium /ruːˈθiːnɪəm/ n - a hard brittle white element of the platinum metal group. It occurs free with other platinum metals in pentlandite and other ores and is used to harden platinum and palladium. Symbol: Ru; atomic no: 44; atomic wt: 101.07; valency: 0–8; relative density: 12.41; melting pt: 2334°C; boiling pt: 4150°C
Etymology: 19th Century: from Medieval Latin Ruthenia Russia, where it was first discovered |