Rubidium is a chemical element wi seembol Rb an atomic nummer 37.
Rubidium is a saft, sillery-white metallic element o the alkali metal group, wi an atomic mass o 85.4678. Elemental rubidium is heichly reactive, wi properties seemilar tae those o ither alkali metals, sic as very rapid oxidation in air. Naitural rubidium is a mix o twa isotopes: 85Rb, the anly stable ane, constitutes 72% o it. The remainin 28% is the slichtly radioactive87Rb wi a hauf-life o 49 billion year—mair nor three times langer than the estimatit age o the universe.
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