Rubidium
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Rubidium is a chemical element, having the chemical symbol Rb.
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Its atomic number (the number of protons) is 37. It has a Standard Atomic Weight of 85.4678(3), and is typically found as a solid in its elemental form.
Rubidium is considered to be a member of the "Alkali metal" class of elements, has a boiling point of 688 °C , and a melting point of 39.3 °C .
Isotopes
Rubidium has two naturally occurring isotopes: 85Rb with mass (atomic weight) 84.911 7893 and abundance 72.17%, and 87Rb with mass 86.909 1835 and abundance 27.83%.[1] The very dilute gas of ground state 87Rb atoms at a temperature of 1.7•10−7 K shows Bose-Einstein condensation.