Facts About Thulium and Hafnium
Interesting Facts
- Thulium metal can resist corrosion due to dry air .
- Only Tm-169 isotope of Thulium metal occur naturally.
  
- Hafnium metal is highly reactive, hence not found free in nature.
- Hafnium metal as predicated after Mendeleev finished his periodic table.
  
Sources
Found in Minerals, Mining, Ores of Minerals
  
By-product Zirconium Refining
  
History
  
  
Who Discovered
Per Teodor Cleve
  
Dirk Coster and George de Hevesy
  
Discovery
In 1879
  
In 1922
  
Abundance
  
  
Abundance In Sun
~0.00000002 %
  
28
~0.0000001 %
  
26
Abundance In Earth's Crust