| 释义 |
WordReference Random House Unabridged Dictionary of American English © 2024rho•di•um (rō′dē əm),USA pronunciation n. [Chem.]- Chemistrya silvery-white metallic element of the platinum family, forming salts that give rose-colored solutions: used to electroplate microscopes and instrument parts to prevent corrosion. Symbol: Rh;
at. wt.: 102.905;
at. no.: 45;
sp. gr.: 12.5 at 20°C.
- Neo-Latin; see rhod-, -ium
- 1804
Collins Concise English Dictionary © HarperCollins Publishers:: rhodium /ˈrəʊdɪəm/ n - a hard corrosion-resistant silvery-white element of the platinum metal group, occurring free with other platinum metals in alluvial deposits and in nickel ores. It is used as an alloying agent to harden platinum and palladium. Symbol: Rh; atomic no: 45; atomic wt: 102.90550; valency: 2–6; relative density: 12.41; melting pt: 1963±3°C; boiling pt: 3697±100°C
Etymology: 19th Century: New Latin, from Greek rhodon rose, from the pink colour of its compounds |