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.

This page in German - Diese Seite in Deutsch
© 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
These recommendations are believed to be correct. However, no guarantee of their accuracy is given. Therefore, purchasers shall make their own tests to determine suitability for their use. These products are offered for industrial and related uses (e.g. research and development) only. However the user must take the necessary precautions appropriate for products containing chemicals. This description does not imply the absence of any patents, the responsibility whatsoever solely rests with the user.