- Protactinium is
a chemical element in the periodic table that has the symbol Pa and
atomic number is 91 and it is a malleable, shiny, silver-gray radioactive metal that does not tarnish rapidly in air.
- It is harmful due to
its radioactivity and is also toxic and it is one of the rarest and
most expensive naturally occurring elements.
- A short-lived
radioactive metallic element formed from uranium and disintegrating
into actinium and then into Lead.
- Protactinium occurs in
vanishingly small quantities in the natural decay chains of uranium
and thorium minerals.
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