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
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 - 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 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 | 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
Protactinium | Pa (Element) - PubChem Protactinium was first isolated by Aristid V Grosse in 1934 Protactinium is a rare, poisonous and expensive element that is present in uranium ores in very small amounts
Protactinium Facts, Symbol, Discovery, Properties, Uses Protactinium is a highly radioactive metal belonging to the family of actinides and denoted by the chemical symbol Pa [1] It has 27 isotopes with mass numbers ranging from 212 to 238 out of which protactinium-231 is the most stable one with a half-life of 3 276 x 10 4 years
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 a actinide
WebElements Periodic Table » Protactinium » the essentials 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
Protactinium (Pa) Protactinium is the 91st element in the periodic table and has a symbol of Pa and atomic number of 91 It has an atomic weight of (231 03588) and a mass number of 231 Protactinium has ninety-one protons and one hundred forty neutrons in its nucleus, and ninety-one electrons in seven shells