Monday, February 18, 2013



  • 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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