| 释义 |
WordReference Random House Unabridged Dictionary of American English © 2024sa•mar•i•um (sə mâr′ē əm),USA pronunciation n. [Chem.]- Chemistrya rare-earth metallic element discovered in samarskite. Symbol: Sm;
at. wt.: 150.35;
at. no.: 62;
sp. gr.: 7.49.
- Neo-Latin; see samarskite, -ium
- 1875–80
Collins Concise English Dictionary © HarperCollins Publishers:: samarium /səˈmɛərɪəm/ n - a silvery metallic element of the lanthanide series occurring chiefly in monazite and bastnaesite and used in carbon-arc lighting, as a doping agent in laser crystals, and as a neutron-absorber. Symbol: Sm; atomic no: 62; atomic wt: 150.36; valency: 2 or 3; relative density: 7.520; melting pt: 1074°C; boiling pt: 1794°C
Etymology: 19th Century: New Latin, from samarskite + -ium |