| 单词 | cerium |
| 释义 | Word Frequency cerium(ˈsɪərɪəm) noun 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 Word origin C19: New Latin, from Ceres (the asteroid) + -ium |
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