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 .