91
Pa
231.035882Protactinium
Appearancebright, silvery metallic luster
Categoryactinide
Discovered byWilliam Crookes
Named byOtto Hahn
What element is Pa on the periodic table?Pa is the element Protactinium on the periodic table.
What is the symbol for Protactinium on the periodic table?The symbol for Protactinium on the periodic table is Pa.
What does Protactinium look like?To the human eye, Protactinium is bright, silvery metallic luster.
About ProtactiniumProtactinium 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. It forms various chemical compounds, in which protactinium is usually present in the oxidation state +5, but it can also assume +4 and even +3 or +2 states. Concentrations of protactinium in the Earth's crust are typically a few parts per trillion, but may reach up to a few parts per million in some uraninite ore deposits. Because of its scarcity, high radioactivity, and high toxicity, there are currently no uses for protactinium outside scientific research, and for this purpose, protactinium is mostly extracted from spent nuclear fuel. It is also the only highly radioactive mononuclidic element that is not also monoisotopic, occurring almost exclusively through the decay of Uranium-235.Source: Wikipedia