Home 61 Pm Promethium back to the periodic table
 
Atomic number   61
Symbol   Pm
Atomic weight   146.9151
Density [g/cm3]   7.22
Melting point [°C]   1080
Boiling point [°C]   2730
1st Ionization energy [eV]   5.55
Electronic configuration   [Xe] 4f5 6s2
Oxidation number (most stable)   3
Atomic radius [pm]   181.0
Ionic radius [pm]   96 (3+)
Abundance in crustal rocks [ppm]   traces
Origin of the name   after Prometheus, in Greek mythology, who stole the fire from the gods.
Discovery   1945 by the American researchers Marinsky, Glendenin and Coryell
Uses   as ß-emitters and for radionuclide batteries in the satellite technique.
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 © 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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