Home 57 La Lanthanum back to the periodic table
 
Atomic number   57
Symbol   La
Atomic weight   138.9055
Density [g/cm3]   6.16
Melting point [°C]   920
Boiling point [°C]   3470
1st Ionization energy [eV]   5.577
Electronic configuration   [Xe] 5d 6s2
Oxidation number (most stable)   3
Atomic radius [pm]   187.0 (a)
Ionic radius [pm]   114 (3+)
Abundance in crustal rocks [ppm]   35
Origin of the name   (greek) lanthanein = to lie hidden
Discovery   1839 by Mosander
Uses   minor application in the technique as alloy aids due to the very good reaction with O and S.
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 © 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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