Home 87 Fr Francium back to the periodic table
 
Atomic number   87
Symbol   Fr
Atomic weight   223.0197
Density [g/cm3]   ---
Melting point [°C]   27
Boiling point [°C]   677
1st Ionization energy [eV]   4.0
Electronic configuration   [Rn] 7s
Oxidation number (most stable)   1
Atomic radius [pm]   ca. 270
Ionic radius [pm]   180 (1+)
Abundance in crustal rocks [ppm]   ---
Origin of the name   named after France
Discovery   1939 by the French M. Perey
Uses   no technical significance.
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 © 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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