Interesting Facts
Sources
Who Discovered
Discovery
Abundance In Universe
Abundance In Sun
Abundance In Meteorites
Abundance In Earth's Crust
Abundance In Oceans
Abundance In Humans
- Protactinium metal has 29 isotopes.
- Isotopes of Protactinium-231 used in nuclear weapon.
Found in Uranium Ores, Mining, Ores of metals
- Hafnium metal is highly reactive, hence not found free in nature.
- Hafnium metal as predicated after Mendeleev finished his periodic table.
By-product Zirconium Refining
Dirk Coster and George de Hevesy