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单词 praseodymium
释义 praseodymium[,preiziəu'dimiəm]n. 镨【化】 镨Pr【医】 镨(59号元素) praseodymium  pra.se.o.dym.i.um  AHD:  [pr³”z¶-½-d¹m“¶-…m, pr³”s¶-] D.J.  [7pre!zi8*&6d!mi8*m, 7pre!si8-]K.K.  [7prezio6d!mi*m, 7presi-]n.Symbol Pr (名词)符号 Pr 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&9{=}C; boiling point 3,127&9{=}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&9{=}C;沸点3,127&9{=}C;比重6.8;化合价3,4参见 element语源:1. New Latin 现代拉丁语 2. from Greek prasios [leek-green]  from prason [leek] 源自 希腊语 prasios [葱绿]  源自 prason [葱] 3. (di)dymium (di)dymium
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