Facts About Holmium and Protactinium
Interesting Facts
- Holmium metal is very soft and malleable.
- Holmium metal is well known for its corrosion resistivity.
  
- Protactinium metal has 29 isotopes.
- Isotopes of Protactinium-231 used in nuclear weapon.
  
Sources
Found in Minerals, Mining, Ores of Minerals
  
Found in Uranium Ores, Mining, Ores of metals
  
History
  
  
Who Discovered
Marc Delafontaine
  
William Crookes
  
Discovery
In 1878
  
In 1900
  
Abundance
  
  
Abundance In Universe
Not Available
  
Abundance In Meteorites
Not Available
  
Abundance In Earth's Crust