Facts About Promethium and Californium
Interesting Facts
- Promethium metal found in Pitchblende.
- Promethium metal is highly radioactive metal.
  
- Californium metal is very harmful and highly radioactive.
- Californium metal is the heaviest metal.
  
Sources
Found in Minerals, Mining
  
Made by Bombarding Curium with Helium Ions
  
History
  
  
Who Discovered
Chien Shiung Wu, Emilio Segrè, Hans Bethe
  
Lawrence Berkeley National Laboratory
  
Discovery
In 1942
  
In 1950
  
Abundance