symbol Rb, atomic number 37, atomic weight 85.47, nuclear external electron configuration-3s²3p⁶3dk UP>104s²4p⁶5s¹ the Periodic Table in the fifth cycle of group A 1. Metal atom radius 247.5 picometer (Pm), the ionic radius of 147 picometer, 405kJ/mol the first ionization energy, electricity negative 0.8, +1 oxidation number. A silver-white metallic sheen, soft and hardness of 0.3, the density 1.532g/cm3 (Solid), 1.475g/cm3 (liquid), 38.39 ° C melting point, boiling point of 688 ° C, the electric conductivity of 7.7. Very lively nature of the chemical in the air oxide layer formed soon lose their luster and spontaneous generation of superoxide dark brown RbO2. Ozone rubidium hydroxide with the response of ozone generated Rb, Rb with chlorine or bromine fierce reaction formation flame burning, not react with nitrogen. Rubidium fierce reaction with the water and explode, with the temperature below -100 ° C ice can be dramatic reaction to produce hydrogen and rubidium hydroxide. With hydride hydrogen combine to form rubidium. It is alkali metal hydride most unstable one of the melting heating anticipate that the Bank decomposition, Rb normally stored in kerosene Lane. Rubidium Vapor at 180 ° C significantly Jiang red, which is higher than 250 ° C, while the yellow and orange. Rubidium is excellent optoelectronic properties, rubidium atoms by the light irradiation will be released from electronic excitation using this feature, it can rubidium in silver plating film, made photocell, which are widely used in movies, television, automatic control equipment. Rubidium can be as strong combination with oxygen, creating vacuum tube when used as oxygen agent. Rubidium amalgam used as a catalyst. Some of the compounds used rubidium medicine. In 1861 Germany and the Ben Kirchhoff, using spectral analysis of extracts from the mica found rubidium, and according to the color spectrum named rubidium (intent is dark-red). Rubidium in nature is very small and scattered, water content, re-crystallization using extracted from seawater rubidium chloride. Available electrolytic melt rubidium chloride prepared rubidium, but it's dangerous, the main industrial calcium or magnesium in 700 ~ 800 ° C under vacuum conditions and the reduction of chlorinated Preparation Rubidium Rb. Rubidium boiling point lower than calcium to facilitate separation of the collection.