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- Protactinium abstract "Protactinium is a chemical element with symbol Pa and atomic number 91. It is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. It forms various chemical compounds where protactinium is usually present in the oxidation state +5, but can also assume +4 and even +2 or +3 states. 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. Because of its scarcity, high radioactivity and high toxicity, there are currently no uses for protactinium outside of scientific research, and for this purpose, protactinium is mostly extracted from spent nuclear fuel.Protactinium was first identified in 1913 by Kasimir Fajans and Oswald Helmuth Göhring and named brevium because of the short half-life of the specific isotope studied, namely protactinium-234. A more stable isotope (231Pa) of protactinium was discovered in 1917/18 by Otto Hahn and Lise Meitner, and they chose the name proto-actinium, but then the IUPAC named it finally protactinium in 1949 and confirmed Hahn and Meitner as discoverers. The new name meant \"parent of actinium\" and reflected the fact that actinium is a product of radioactive decay of protactinium. It is noted that John Arnold Cranston (working with Frederick Soddy) is also credited with discovering the stable isotope in 1915 but delayed his announcement due to being called up for service in the First World War.The longest-lived and most abundant (nearly 100%) naturally occurring isotope of protactinium, protactinium-231, has a half-life of 32,760 years and is a decay product of uranium-235. Much smaller trace amounts of the short-lived nuclear isomer protactinium-234m occur in the decay chain of uranium-238. Protactinium-233 results from the decay of thorium-233 as part of the chain of events used to produce uranium-233 by neutron irradiation of thorium-232. It is an undesired intermediate product in thorium-based nuclear reactors and is therefore removed from the active zone of the reactor during the breeding process. Analysis of the relative concentrations of various uranium, thorium and protactinium isotopes in water and minerals is used in radiometric dating of sediments which are up to 175,000 years old and in modeling of various geological processes.".
- Protactinium thumbnail Mendelejevs_periodiska_system_1871.png?width=300.
- Protactinium wikiPageExternalLink 091.htm.
- Protactinium wikiPageID "23322".
- Protactinium wikiPageLength "44637".
- Protactinium wikiPageOutDegree "169".
- Protactinium wikiPageRevisionID "704933548".
- Protactinium wikiPageWikiLink Acid.
- Protactinium wikiPageWikiLink Actinide.
- Protactinium wikiPageWikiLink Actinium.
- Protactinium wikiPageWikiLink Ada_Hitchins.
- Protactinium wikiPageWikiLink Alpha_decay.
- Protactinium wikiPageWikiLink Alpha_particle.
- Protactinium wikiPageWikiLink Aluminium_bromide.
- Protactinium wikiPageWikiLink Aluminium_iodide.
- Protactinium wikiPageWikiLink Ammonium_iodide.
- Protactinium wikiPageWikiLink Aristid_von_Grosse.
- Protactinium wikiPageWikiLink Atlantic_Ocean.
- Protactinium wikiPageWikiLink Atomic_number.
- Protactinium wikiPageWikiLink Barium.
- Protactinium wikiPageWikiLink Basic_oxide.
- Protactinium wikiPageWikiLink Bentonite.
- Protactinium wikiPageWikiLink Beta_decay.
- Protactinium wikiPageWikiLink Beta_particle.
- Protactinium wikiPageWikiLink Bismuth.
- Protactinium wikiPageWikiLink Bromide.
- Protactinium wikiPageWikiLink Bromine_pentafluoride.
- Protactinium wikiPageWikiLink Bromine_trifluoride.
- Protactinium wikiPageWikiLink Butterworth-Heinemann.
- Protactinium wikiPageWikiLink Calcium_fluoride.
- Protactinium wikiPageWikiLink Carbon_disulfide.
- Protactinium wikiPageWikiLink Carbon_tetrachloride.
- Protactinium wikiPageWikiLink Category:Actinides.
- Protactinium wikiPageWikiLink Category:Chemical_elements.
- Protactinium wikiPageWikiLink Category:Protactinium.
- Protactinium wikiPageWikiLink Chemical_compound.
- Protactinium wikiPageWikiLink Chemical_element.
- Protactinium wikiPageWikiLink Chloride.
- Protactinium wikiPageWikiLink Coordination_number.
- Protactinium wikiPageWikiLink Critical_mass.
- Protactinium wikiPageWikiLink Cross_section_(physics).
- Protactinium wikiPageWikiLink Crystal_bar_process.
- Protactinium wikiPageWikiLink Crystal_structure.
- Protactinium wikiPageWikiLink Cubic_crystal_system.
- Protactinium wikiPageWikiLink Curie.
- Protactinium wikiPageWikiLink Cyclooctatetraene.
- Protactinium wikiPageWikiLink Cyclopentadienyl_complex.
- Protactinium wikiPageWikiLink Czech_Republic.
- Protactinium wikiPageWikiLink Decay_product.
- Protactinium wikiPageWikiLink Democratic_Republic_of_the_Congo.
- Protactinium wikiPageWikiLink Dmitri_Mendeleev.
- Protactinium wikiPageWikiLink Dubnium.
- Protactinium wikiPageWikiLink Ether.
- Protactinium wikiPageWikiLink Ferromagnetism.
- Protactinium wikiPageWikiLink Fluoride.
- Protactinium wikiPageWikiLink Formula_unit.
- Protactinium wikiPageWikiLink Frederick_Soddy.
- Protactinium wikiPageWikiLink Germany.
- Protactinium wikiPageWikiLink Glacier.
- Protactinium wikiPageWikiLink Glovebox.
- Protactinium wikiPageWikiLink Great_Britain.
- Protactinium wikiPageWikiLink Half-life.
- Protactinium wikiPageWikiLink Halide.
- Protactinium wikiPageWikiLink Hydrochloric_acid.
- Protactinium wikiPageWikiLink Hydrofluoric_acid.
- Protactinium wikiPageWikiLink Hydrogen_bromide.
- Protactinium wikiPageWikiLink Hydrogen_cyanide.
- Protactinium wikiPageWikiLink Hydrogen_fluoride.
- Protactinium wikiPageWikiLink Hydrogen_sulfide.
- Protactinium wikiPageWikiLink Hydroxide.
- Protactinium wikiPageWikiLink Ice_age.
- Protactinium wikiPageWikiLink International_Union_of_Pure_and_Applied_Chemistry.
- Protactinium wikiPageWikiLink Iodide.
- Protactinium wikiPageWikiLink Ionizing_radiation.
- Protactinium wikiPageWikiLink Isotope.
- Protactinium wikiPageWikiLink John_Arnold_Cranston.
- Protactinium wikiPageWikiLink Jáchymov.
- Protactinium wikiPageWikiLink Kazimierz_Fajans.
- Protactinium wikiPageWikiLink Lise_Meitner.
- Protactinium wikiPageWikiLink Lithium.
- Protactinium wikiPageWikiLink Loam.
- Protactinium wikiPageWikiLink Mass_spectrometry.
- Protactinium wikiPageWikiLink Melting_point.
- Protactinium wikiPageWikiLink Mendeleevs_predicted_elements.
- Protactinium wikiPageWikiLink Molten_salt_reactor.
- Protactinium wikiPageWikiLink Monoclinic_crystal_system.
- Protactinium wikiPageWikiLink Neutron_economy.
- Protactinium wikiPageWikiLink Neutron_poison.
- Protactinium wikiPageWikiLink Nitrate.
- Protactinium wikiPageWikiLink Nitric_acid.
- Protactinium wikiPageWikiLink Nuclear_fission.
- Protactinium wikiPageWikiLink Nuclear_fuel.
- Protactinium wikiPageWikiLink Nuclear_isomer.
- Protactinium wikiPageWikiLink Nuclear_reactor.
- Protactinium wikiPageWikiLink Nuclear_weapon.
- Protactinium wikiPageWikiLink Oak_Ridge_National_Laboratory.
- Protactinium wikiPageWikiLink Oswald_Helmuth_Göhring.
- Protactinium wikiPageWikiLink Otto_Hahn.
- Protactinium wikiPageWikiLink Oxidation_state.
- Protactinium wikiPageWikiLink Oxygen.