| 单词 | praseodymium |
| 释义 | Word Frequency praseodymium(ˌpreɪzɪəʊˈdɪmɪəm) noun a malleable ductile silvery-white element of the lanthanide series of metals. It occurs principally in monazite and bastnaesite and is used with other rare earths in carbon-arc lights and as a pigment in glass. Symbol: Pr; atomic no: 59; atomic wt: 140.90765; valency: 3; relative density: 6.773; melting pt: 931°C; boiling pt: 3520°C Word origin C20: New Latin, from Greek prasios of a leek-green colour + didymium |
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