Home 55 Cs Caesium back to the periodic table
 
Atomic number   55
Symbol   Cs
Atomic weight   132.90543
Density [g/cm3]   1.90
Melting point [°C]   28.4
Boiling point [°C]   690
1st Ionization energy [eV]   3.894
Electronic configuration   [Xe] 6s
Oxidation number (most stable)   1
Atomic radius [pm]   265.5
Ionic radius [pm]   170 (1+)
Abundance in crustal rocks [ppm]   2.6
Origin of the name   (lat.) caesius = sky blue (due to its flame coloration)
Discovery   1860 by Bunsen and Kirchhoff
Uses   for scientific purposes.
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 © 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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