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91 Pa

Protactinium

Actinide
Atomic Mass
231.03588 u
Density
15.37 g/cm³
Melting Point
1,570°C
Boiling Point
Not well established
State
Solid
Discovery
1913

Discovery

Discovered by K. Fajans and O. Göhring in 1913.

Common Uses

  • Primarily used in scientific research due to its scarcity
  • No significant commercial applications

Interesting Facts

  • Protactinium is one of the rarest and most expensive naturally occurring elements.
  • It was initially called "brevium" due to its short half-life.
  • Highly radioactive and toxic, requiring careful handling.
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