Rubidium is a soft and highly reactive member of the alkali group of metals. It is widely distributed throughout nature, but only occurs in small amounts, the main source being carnallite, the hydrated chloride of magnesium and potassium. The metal is obtained by the electrolysis of the fused halide, although it can be obtained on a laboratory scale by heating the chloride with calcium metal and distilling out the metal. The metal ignites spontaneously in air and reacts violently with water and applications are limited.


1861 by R.W. Bunsen and G. Kirchoff in Heidelberg, Germany.

310 ppm in the earth’s crust.

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Atomic number 37 Clip
Atomic / Molecular Weight 85.4678 gmol-1Clip
Density 1533 kgm-3Clip
Crystal Structure bcc Clip
Lattice constant 571 fmClip
Melting Point 312.06 KClip
Boiling Point 978 KClip
Specific heat capacity 360 Jkg-1K-1Clip
Thermal conductivity 58 Wm-1K-1Clip
Bulk Modulus of Rigidity 2500000000 Nm-2Clip
Electromotive Series 2.99 VClip
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See also: Bunsen, Robert Wilhelm, Periodic Table, Rubidium Bromide, Rubidium Chloride, Rubidium Fluoride, Rubidium Hydride, Rubidium Iodide, Rubidium Oxide, Rubidium Peroxide, Rubidium Sulphide, Rubidium Superoxide.

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Subjects: Chemistry