Rubidium
Chemical element
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Rubidium is a chemical element; it has symbol Rb and atomic number 37. It is a very soft, whitish-grey solid in the alkali metal group, similar to potassium and caesium. Rubidium is the first alkali metal in the group to have a density higher than... Wikipedia
Symbol: Rb
Electron configuration: [Kr] 5s¹
Atomic number: 37
Atomic mass: 85.4678 u
Melting point: 103.1°F (39.48°C)
Boiling point: 1,270°F (688°C)
Discoverers: Robert Bunsen and Gustav Kirchhoff