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Göhring. The first isotope, protactinium-234, was discovered (1913) by American chemists Kasimir Fajans and O.H. Its melting point is thought to be about 1,560°C (2,840°F) and its density about 15.37 grams per cubic centimeter. It occurs at ppm levels in uranium ores and is extracted from these ores. Protactinium is a silver metallic element that is in the actinide group, with a bright metallic shine that it keeps for some time in the air. Additionally, a method for making the protactinium metal … It has 91 protons in its nucleus, which means it is the 91st element on the periodic table. Question: Protactinium (Pa), A Highly Toxic Metal, Is One Of The Rarest And Most Expensive Elements. Protactinium metal is a dense, silvery-gray material with a bright metallic luster which it retains for some time in air but it does readily react with oxygen, water vapor and inorganic acids to form various compounds. Its melting point is thought to be about 1,560 ° C (2,840 ° F) and its density about 15.37 grams per cubic centimeter. There are twenty-four known isotopes of Pa, having mass numbers ranging from 214 to 238, the most stable isotope being 231 Pa. Protactinium metal is silvery and relatively nonreactive. The chemical symbol for Protactinium is Pa. Protactinium is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. They named it brevium, afterward uranium X 2, because it was a … Protactinium is a chemical element with atomic number 91 which means there are 91 protons and 91 electrons in the atomic structure. Protactinium metal was first prepared (1934) by American chemist Aristid V. Grosse. Protactinium is a rare, poisonous and expensive element that is present in uranium ores in very small amounts. When exposed to air, it combines easily with oxygen to form a whitish coating of protactinium German chemist Otto Hahn was involved in early work with protactinium. Due to its scarcity, high radioactivity and toxicity, there are currently no uses for protactinium … After separation of the tungsten sphere and degassing of the actinide metal by litation melting in a Hukin crucible, the protactinium metal is recovered as a small sphere and stored in a vacuum-sealed quartz tube. When exposed to air, it combines easily with oxygen to form a whitish coating of protactinium oxide. Comprehensive information for the element Protactinium - Pa is provided by this page including scores of properties, element names in many languages, most known nuclides and … The deposition temperature is maintained between 1200 and the melting point of the protactinium metal (1525 ). oxide. In solid compounds protactinium is most stable in the oxidation state +5, but it also exists in the +4, +3 and +2 oxidation states. Protactinium is a radioactive metal that is found in the actinide series of the periodic table. In 1961, the Great Britain Atomic Energy Authority was able to produce 125 grams of 99.9% pure protactinium, although they had to process about 55,000 kilograms of ore and spend about $500,000 to get it. Protactinium is a bright shiny metal. Currently known uses of Protactinium metal are limited to research purpose only. It is superconductive at temperatures below 1.4 K. Applications. Report discussing methods for preparing various protactinium compounds, including protactinium oxides, tetrafluoride, and oxysulfide. Protactinium is a bright shiny metal. , because it was a … protactinium is a chemical element with atomic number 91 which means are. ( 2,840°F ) and its density about 15.37 grams per cubic centimeter are 91 and... 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