ru.bid.i.um
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 '88=C; specific gravity (solid) .532; valence , 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'88=C；比重（固体）.532；化合价,2,3,4参见 element
来源：From Latin rubidus [red] * see reudh- 源自 拉丁语 rubidus [红色的] *参见 reudh-
