Trace Elements Laboratory
A Joint Venture of London Health Sciences Centre and St. Joseph's Health Care London
Protactinium (Pa)
This element is not currently measured in this laboratory.
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Atomic Number:

91

Atomic Symbol:

Pa

Atomic Weight: 231.0359
Electron Configuration:

[Rn]7s25f26d1


Protactinium has a bright metallic lustre which it retains for some time in air. The element is
superconductive below 1.4 K. The element is a dangerous toxic material and requires precautions
similar to those used when handling plutonium. Protactinium is one of the rarest and most expensive
naturally occurring elements. The element is an a-emitter and is a radiological hazard similar to polonium.
Protactinium is a highly toxic and radioactive rare earth metal that requires special handling. It is found in pitchblende and ores form Zaire and is one of the rarest and most expensive naturally occurring elements.




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April 8, 2008