os.mi.um
n.Symbol Os （名词）符号 Os A bluish-white, hard metallic element, found in small amounts in osmiridium, nickel, and platinum ores. It is used as a platinum hardener and in making pen points, phonograph needles, and instrument pivots. Atomic number 7'; atomic weight 90.2; melting point 3,000=C; boiling point 5,000=C; specific gravity 22.57; valence 2, 3, 4, 8.See table at element 锇：一种白色带点蓝色的硬金属元素，在铱锇矿、镍及铂的矿石中有少量储藏。用作铂的硬化剂并用于制作笔尖、唱片针和仪表枢轴。原子序数为7'；原子量为90.2；熔点为3,000=C；沸点为5,000=C；比重为22.57；化合价为2，3，4，8参见 element
来源：From Greek osmô [smell (from the strong odor of osmium tetroxide)] 源自 希腊语 osmô [气味（由四氧化锇的强烈气味得名）]
