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Text File  |  1992-10-03  |  428b  |  15 lines
  1.                                    THORIUM
  2. Atomic symbol - Th
  3. Atomic weight - 232.0381
  4. Atomic number - 90
  5. Electron configuration - 2-8-18-32-18-10-2
  6. Oxidation states - +4
  7. State of matter - solid
  8. Heavy metal-ductile
  9. Discovered in 1828 by Jöns Jacob Berzelius
  10. Boils at about 4000 °C, melts at about 1700 °C
  11.  
  12. Notes:
  13. Thorium is a radioactive element. It is silvery white but when exposed to air 
  14. turns gray or black. 
  15.