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Text File  |  1992-10-03  |  404b  |  14 lines
  1.                                  PROTACTINIUM
  2. Atomic symbol - Pa
  3. Atomic weight - (231.0359)
  4. Atomic number - 91
  5. Electron configuration - 2-8-18-32-20-9-2
  6. Oxidation states - +4, +5
  7. State of matter - solid
  8. heavy metal-ductile
  9. Discovered in 1913 by Kasimir Fajans and O.H. Göhring
  10. Boils at unknown, melts at unknown
  11.                                
  12. Notes:
  13. Protactinium is a radioactive element. 
  14.