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Text File  |  1992-09-14  |  409b  |  14 lines
  1.                                    HAFNIUM
  2. Atomic symbol - Hf
  3. Atomic weight - 178.49
  4. Atomic number - 72
  5. Electron configuration - 2-8-18-32-10-2
  6. Oxidation states - +4
  7. State of matter - solid
  8. Heavy metal-ductile
  9. Discovered in 1923 by Dirk Coster and George Charles de Hevesy
  10. Boils at 5400 °C, melts at 2150 °C
  11.  
  12. Notes:
  13. Chemically similar to zirconium (40), hafnium is used as nuclear control rods. 
  14.