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ru·bid·i·um AHD[ro͞o-bĭdʹē-əm] D.J.[ruːˈbɪdiːəm]K.K.[ruˈbɪdiəm]n.Symbol Rb （名词）符号 Rb - A soft silvery-white metallic element of the alkali group that ignites spontaneously in air and reacts violently with water, used in photocells and in the manufacture of vacuum tubes. Atomic number 37; atomic weight 85.47; melting point 38.89°C; boiling point 688°C; specific gravity (solid) 1.532; valence 1, 2, 3, 4. See table at element 铷：一种银白色的软的碱性金属元素，与空气接触会立即燃烧，与水反应剧烈，用于光电池和制造真空管。原子序数37；原子量85.47；熔点38.89°C；沸点688°C；比重（固体）1.532；化合价1,2,3,4 参见 element
- From Latin rubidus [red] * see reudh- 源自 拉丁语 rubidus [红色的] * 参见 reudh-
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