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  1.                                    THULIUM
  2. Atomic symbol - Tm
  3. Atomic weight - 168.93421
  4. Atomic number - 69
  5. Electron configuration - 2-8-18-31-8-2
  6. Oxidation states - +3
  7. State of matter - solid
  8. Heavy metal-brittle
  9. Discovered in 1879 by Per Teodor Cleve
  10. Boils at 1727 ¯C, melts at 1545 ¯C
  11.  
  12. Notes:
  13. Useful in small portable X-Ray units, thulium has few other uses.
  14.