Home 59 Pr Praseodymium back to the periodic table
 
Atomic number   59
Symbol   Pr
Atomic weight   140.90765
Density [g/cm3]   6.48
Melting point [°C]   931
Boiling point [°C]   3130
1st Ionization energy [eV]   5.42
Electronic configuration   [Xe] 4f3 6s2
Oxidation number (most stable)   4, 3
Atomic radius [pm]   182.0 (a)
Ionic radius [pm]   100 (3+)
Abundance in crustal rocks [ppm]   9.1
Origin of the name   (greek) praseos didymos = green twin
Discovery   1885 by Auer von Welsbach
Uses   metallic praseodymium is not used in the technique, its compounds are used for coloring glass (zircon-praseodymium-yellow).
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 © 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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