pra.se.o.dym.i.um
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 40.907; melting point 935=C; boiling point 3,27=C; specific gravity '.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40.907；熔点935=C；沸点3,27=C；比重'.8；化合价3,4参见 element
来源：New Latin 现代拉丁语 from Greek prasios [leek-green] from prason [leek] 源自 希腊语 prasios [葱绿] 源自 prason [葱] (di)dymium (di)dymium
