• Latin name:
  Rubidium
• English name:
  Rubidium
• Year discovered:
  1861
• Discovered by:
  Robert Wilhelm Bunsen, Gustav Robert Kirchhoff
• Country of Discovery:
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• Cost per 100 grams:
  390 USD
• CAS Number:
  CAS7440-17-7
• Electron shell:
  K2-L8-M18-N8-O1-P0-Q0-R0

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.

• Atomic number:
  37
• Atomic weight (Relative atomic mass):
  85.4676635933375 (g/mol)
• Density:
  1.532 (g/cm³)
• Melting point:
  39.3°C = 102.74°F = 312.45K
• Boiling point:
  688.0°C = 1270.40°F = 961.15K
• Valence electrons:
  1
• Period:
  5
• Group:
  IA
• Block:
  s - block
• Emission spectrum:
  

• Phase:
  Solid

  
• Fusion heat:
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• Specific heat:
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• Thermal expansion:
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• Vaporization heat:
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• Electron configuration:
  [Kr] 5s1 = 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s1
Oxidation states:

• -
• -1
• -
• -
• -
• -
• +1
• -
• -
• -
• -
• -
• -
• -
• -
• Ion charge:
  Rb¹⁺
• The ionization potential of an atom:
  4.177 (eV)
• Atomic radius:
  265 (pm)
• Covalent radius:
  215 (pm)
• Van der Waals radius:
  303 (pm)

• Electrical conductivity:
  7812500.0 (S/m)
• Electrical type:
  Conductor
• Magnetic type:
  ----
• Volume magnetic susceptibility:
  0.00000398
• Mass magnetic susceptibility:
  2.6 ⋅ 10^-9
• Molar magnetic susceptibility:
  2.22 ⋅ 10^-10 (m³/mol)
• Resistivity:
  1.28 ⋅ 10^-7 (Ω · m)
• Superconducting point:
  ----

• Debye temperature:
  -217.15°C = -358.87°F = 56K

• Colour:
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• CAS Number:
  CAS7440-17-7
• CID Number:
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• RTEC Number:
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• Brinell hardness:
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• Mohs hardness:
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• Vickers hardness:
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• Bulk modulus:
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• Young's modulus:
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• Liquid density:
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• Molar volume:
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• Poisson's ratio:
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• Shear modulus:
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• Speed of sound transmission:
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• Refractive index:
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• Thermal conductivity:
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• Electronegativity:
  0.82
• Valence electrons:
  1
• Electron affinity:
  46.884 kJ/mole

• Radioactive:
  No
• Half life:
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• Lifetime:
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• Neutron cross section, barn:
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• Universe contains "Rubidium" at the rate of
  1 ⋅ 10^-6%
• Sun contains "Rubidium" at the rate of
  3 ⋅ 10^-4%
• Oceans contain "Rubidium" at the rate of
  1.2 ⋅ 10^-5%
• Human body contains "Rubidium" at the rate of
  0.0009702378302%
• The Earth's crust consists of "Rubidium" at the rate of
  0.009%
• Meteorites consist of "Rubidium" at the rate of
  3.2 ⋅ 10^-4%