| 单词 | 炭精 |
| 释义 | 〔praseodymium〕A soft, silvery, malleable, ductile rare-earth element that develops a characteristic green tarnish in air. It occurs naturally with other rare earths in monazite and is used to color glass and ceramics yellow, as a core material for carbon arcs, and in metallic alloys. Atomic number 59; atomic weight 140.907; melting point 935°C; boiling point 3,127°C; specific gravity 6.8; valence 3, 4. See table at element 镨：一种银色、柔软、可延展的粘性稀土元素，在空气中能形成绿色失泽膜，在自然界中它与其它稀土元素一同存在于独居石中，用于彩色玻璃和陶器黄色颜料，是炭精电弧的核心材料，并用于金属合金。原子序数59；原子量140.907；熔点935°C；沸点3,127°C；比重6.8；化合价3,4 参见 element |
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