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10203040506070809010011000.511.522.53‌ Å

37 - Rubidium alkali metal

Atomic Mass (u)

85.47

Density (g/cm³)

1.53

Phase

Solid

Year of Discovery

1861
RubidiumRbElectron 1Electron 2Electron 1Electron 2Electron 3Electron 4Electron 5Electron 6Electron 7Electron 8Electron 1Electron 2Electron 3Electron 4Electron 5Electron 6Electron 7Electron 8Electron 9Electron 10Electron 11Electron 12Electron 13Electron 14Electron 15Electron 16Electron 17Electron 18Electron 1Electron 2Electron 3Electron 4Electron 5Electron 6Electron 7Electron 8Electron 1

Rubidium is a chemical element with symbol Rb and atomic number 37. Rubidium is a soft, silvery-white metallic element of the alkali metal group, with an atomic mass of 85.4678. Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, such as very rapid oxidation in air.

37 Atomic Number
85.47  u Atomic Mass
312.79  K Melting Point
961  K Boiling Point
1.53  g/cm³ Density
3  Å Atomic Radius
2.2  Å Covalent Radius
0.82 Electronegativity
4.18  eV First Ionization Energy
46.88 Electron Affinity
5 Number of Shells
1 Electron Valency
2, 8, 18, 8, 1 Electron Shell Occupations
0.36  J/g Specific Heat