Hafnium By: Kyndal Brizendine

1
Hafnium!!By Kyndal Brizendine
2
Uses/ Properties of Hafnium!!

• USES
• Hafnium is used for reactor control rods
• Hafnium carbide is perhaps the most refractory
  binary composition
• Hafnium is used in incandescent and gas lamps

• Properties
• boiling point of 4602C
• Hafnium has a melting point of 20C
• has a brilliant silver luster.
• Specific Heat 0.14J/gK

72 Hf 178.49
3
FACTS about Hafnium!!

• Atomic Number 72 
• Symbol Hf
• Atomic Weight 178.49 
• Discovery Coster von  Hevesy 1923. Based on the
  Bohr theory, it was expected that hafnium would
  be associated with zirconium. Ultimately, the
  element was identified in zircon from Norway
  using x-ray spectroscopy. 

• Sources Most zirconium minerals contain 1-5
  hafnium. Originally, hafnium was separated from
  zirconium using repeated recrystallization of
  double ammonium or potassium fluorides.
• van Arkel and deBoer prepared metallic hafnium
  by passing the tetraiodide vapor over a heated
  tungsten filament. Now hafnium is generally
  prepared by the Kroll process of reducing the
  tetrachloride with magnesium or sodium.

4
boiling point of 4602C
was expected that hafnium would be associated
with zirconium
has a brilliant silver luster
Based on the Bohr theory
Properties
Discovery
Specific Heat 0.14J/gK
Hafnium
Atomic Weight  178.49 
Coster von Hevesy 1923.
Quick Facts

• Symbol Hf

5
Sources

• http//www.webelements.com/webelements/scholar/ele
  ments/periodic-table/uses.html
• http//www.chemsoc.org/viselements/pages/pertable.
  com
• http//www.environmentalchemistry.com/yogi/periodi
  c/Hf.com