| 单词 | lanthanum |
| 释义 | Word Frequency lanthanum(ˈlænθənəm) noun a silvery-white ductile metallic element of the lanthanide series, occurring principally in bastnaesite and monazite: used in pyrophoric alloys, electronic devices, and in glass manufacture. Symbol: La; atomic no: 57; atomic wt: 138.9055; valency: 3; relative density: 6.145; melting pt: 918°C; boiling pt: 3464°C Word origin C19: New Latin, from Greek lanthanein to lie unseen |
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