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Text File  |  1992-08-07  |  525b  |  15 lines
  1.                                   LANTHANUM                       
  2. Atomic symbol - La
  3. Atomic weight - 138.9055
  4. Atomic number - 57
  5. Electron configuration - 2-8-18-18-9-2
  6. Oxidation states - +3
  7. State of matter - solid
  8. Heavy metal-britle
  9. Discovered in 1839 by Carl Gustaf Mosander
  10. Boils at 3454 °C, melts at 920 °C
  11.                                  
  12. Notes:
  13. Lanthanum is ductile, malleable, silvery-white metal in the lanthanide series. 
  14. Lanthanum has three allotropic forms. At -268 °C it becomes a superconductor. 
  15.