Rubidium is a chemical component with the symbol Rb and atomic number 37. Rb is a soft, silvery-white metallic component of the alkali metal group. Rubidium is very soft and extremely reactive, with properties like to other elements in group 1, such as very rapid oxidation in air. Its compounds have chemical and electronic applications.

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  1. Rubidium is simply ionized, so it has been measured for use in ion engines for space vehicles.
  2. Rubidium compounds are occasionally used in fireworks to provide them a purple color.