What is Rubidium

Rubidium is a chemical element with the atomic number 37 and the symbol Rb. Atomic Number: 37. It is a soft, silvery-white metallic element of the alkali metal group. Symbol:Rb. It is the second electropositive of the non-radioactive alkali metals and melts when it is at a temperature of 39.3 °C (102.7 °F). Rubidium is the twenty-third most abundant element in the Earth's crust, usually as abundant as zinc and rather more common than copper. Although rubidium is more abundant in Earth's crust than  the lack of a mineral rich in rubidium limits the production of rubidium compounds to 2 to 4 tonnes per year and caesium the limited applications. Rubidium has a very low ionization energy of only 406 kJ/mol. Atomic weight: 85.4678. Rubidium has a number of oxides, including Rb9O2, rubidium monoxide (Rb2O) and Rb6O, which form if rubidium metal is exposed to air; rubidium in excess oxygen gives the superoxide RbO2. Rubidium and potassium show a very similar violet color in the flame test, which makes spectroscopy methods necessary to distinguish the two elements. Rubidium chloride (RbCl) is probably the most used rubidium compound. It is taken up to replace potassium. It is in only small quantities in living organisms.

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