| 释义 |
WordReference Random House Unabridged Dictionary of American English © 2024ce•ri•um (sēr′ē əm),USA pronunciation n. - Chemistrya steel-gray, ductile metallic element of the rare-earth group found only in combination. Symbol: Ce;
at. wt.: 140.12;
at. no.: 58.
Collins Concise English Dictionary © HarperCollins Publishers:: cerium /ˈsɪərɪəm/ n - a malleable ductile steel-grey element of the lanthanide series of metals, used in lighter flints and as a reducing agent in metallurgy. Symbol: Ce; atomic no: 58; atomic wt: 140.115; valency: 3 or 4; relative density: 6.770; melting pt: 798°C; boiling pt: 3443°C
Etymology: 19th Century: New Latin, from Ceres (the asteroid) + -ium |