Facts About Neptunium and Roentgenium
Interesting Facts
Not Available
  
Not Available
  
Sources
Made by Bombarding Uranium with Neutrons, Ores of metals
  
Synthetically Produced
  
History
  
  
Who Discovered
Edwin McMillan and Philip H. Abelson
  
Gesellschaft für Schwerionenforschung
  
Discovery
In 1940
  
In 1994
  
Abundance