Home 37 Rb Rubidium back to the periodic table

Atomic number   37
Symbol   Rb
Atomic weight   85.4678
Density [g/cm3]   1.53
Melting point [°C]   38,9
Boiling point [°C]   688
1st Ionization energy [eV]   4.177
Electronic configuration   [Kr] 5s
Oxidation number (most stable)   1
Atomic radius [pm]   247.5 (a)
Ionic radius [pm]   149 (1+)
Abundance in crustal rocks [ppm]   78
Origin of the name   (lat.) rubidus = dark red, because of its two dark red spectral lines
Discovery   1860 by Bunsen and Kirchhoff
Uses   in the semiconductor technology and for photocathodes.

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© 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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