Rb dating site
Although the distilled rubidium was pyrophoric, they were able to determine the density and the melting point.The quality of this research in the 1860s can be appraised by the fact that their determined density differs by less than 0.1 g/cm Rb, is one of the most commonly used atomic species employed for laser cooling and Bose–Einstein condensation.Zone pegmatite ore bodies containing mineable quantities of caesium as pollucite or the lithium minerals lepidolite are also a source for rubidium as a by-product.Both of those deposits are also sources of caesium.After reduction of the hexachloroplatinate with hydrogen, the process yielded 0.51 grams of rubidium chloride for further studies.Bunsen and Kirchhoff began their first large-scale isolation of caesium and rubidium compounds with 44,000 litres (12,000 US gal) of mineral water, which yielded 7.3 grams of caesium chloride and 9.2 grams of rubidium chloride.They tried to generate elemental rubidium by electrolysis of molten rubidium chloride, but instead of a metal, they obtained a blue homogeneous substance, which "neither under the naked eye nor under the microscope showed the slightest trace of metallic substance".They presumed that it was a subchloride ( In a second attempt to produce metallic rubidium, Bunsen was able to reduce rubidium by heating charred rubidium tartrate.
Rubidium is a very soft, silvery-white metal in the alkali metal group.It is the second most electropositive of the stable alkali metals and melts at a temperature of 39.3 °C (102.7 °F).Like other alkali metals, rubidium metal reacts violently with water.German chemists Robert Bunsen and Gustav Kirchhoff discovered rubidium in 1861 by the newly developed technique, flame spectroscopy.The name comes from the Latin word rubidus, meaning deep red, the color of its emission spectrum.
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Lepidolite contains between 0.3% and 3.5% rubidium, and is the commercial source of the element.