Protactinium - Wikipedia Protactinium is a chemical element; it has symbol Pa and atomic number 91 It is a dense, radioactive, silvery-gray actinide metal which readily reacts with oxygen, water vapor, and inorganic acids
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Protactinium - Element information, properties and uses | Periodic Table Small amounts of protactinium are found naturally in uranium ores It is also found in spent fuel rods from nuclear reactors, from which it is extracted Mendeleev said there should be an element between thorium and uranium, but it evaded detection
Protactinium | Radioactive, Decay, Isotopes | Britannica protactinium (Pa), radioactive chemical element of the actinoid series of the periodic table, rarer than radium; its atomic number is 91 It occurs in all uranium ores to the extent of 0 34 part per million of uranium
Periodic Table of Elements: Los Alamos National Laboratory Protactinium is one of the rarest and most expensive naturally occurring elements The average concentrations of protactinium in the Earth's crust is typically on the order of a few parts per trillion, but may reach up to a few parts per million in some uraninite ore deposits
Protactinium | Pa (Element) - PubChem Chemical element, Protactinium, information from authoritative sources Look up properties, history, uses, and more
Protactinium Facts - Symbol Pa or Atomic Number 91 Protactinium (Pa) is a rare, radioactive metal with atomic number 91 and a silvery-gray appearance It belongs to the actinide series and occurs naturally in trace amounts in uranium ores as part of the uranium-235 decay chain
Protactinium Element Facts Protactinium is a very rare shiny, silvery, highly radioactive metal that tarnishes slowly in air to the oxide Almost all naturally occurring protactinium is the 231 isotope
Protactinium (Pa) - Periodic Table Protactinium is a chemical element of the periodic table with chemical symbol Pa and atomic number 91 with an atomic weight of 231 036 u and is classed as actinide Protactinium is solid at room temperature