Relative atomic mass: 85.4678 +- 0.0003

English: Rubidium
French: Rubidium
Croatian: Rubidij
German: Rubidium
Italian: Rubidio
Spanish: Rubidio

Atomic number: 37
Group numbers: 1
Period: 5
Standard state (20 oC): solid

Discovery: 1861 Robert Wilhelm Bunsen, Gustav Robert Kirchhoff (DE)
Rubidium was discovered by Robert Wilhelm Bunsen and Gustav Robert Kirchhoff (DE) in 1861. The origin of the name comes from the Latin word rubidius meaning dark red or deepest red. It is a soft, silvery-white, highly reactive metal that ignites in air and reacts violently with water or oxidants. Rubidium occurs abundantly, but so widespread that production is limited. It is usually obtained from lithium production. It is used in photocells, cathode-ray and vacuum tubes, and as a catalyst. The price of 99.8 % pure rubidium metal is 1669.80 for 100 g.
Electronic configuration: [Kr] 5s1
Formal oxidation number: +1
Atomic radius: 247.5 pm

Electronegativities: 0.82
Thermal conductivity: 52.8 W/(m K)
Electrical resistivity (20 oC): 12.5 microOhm cm

Melting point: 39.31 oC
Boiling point: 688 oC

Heat of fusion: 2.2 kJ/mol
Heat of vaporization: 75.7 kJ/mol
Heat of atomization: 82.17 kJ/mol

36Kr <= 37Rb => 38Sr

ASCII Periodic Table of the Elements
29 Aug. 2017
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