Plutonium's most stable isotope, plutonium-244, has a half-life of about 82,000,000 years. It is usually alloyed with small amounts of gallium. PLUTONIUM-239. Plutonium is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a … It has been called the most complex metal and a physicist's dream but an engineer's nightmare. Plutonium is a radioactive metallic element with the atomic number 94. The atomic number of it is 94. Plutonium was used in several of the first atomic bombs, and is still used in nuclear weapons. Plutonium is a trans-uranic radioactive element in the actinide series. Nearly all plutonium is man-made. Plutonium is the second transuranic element with an atomic number of 94 and part of the actinide group of the periodic table. UNII-ET2Z8EJJ1X. Plutonium (Pu) was discovered in 1940 by Glenn Seaborg and colleagues at the University of California, Berkeley, and is a radioactive metallic element with the atomic number 94 (the number of protons in the nucleus). Plutonium has six allotropes. This is a collection of plutonium element facts. The chemical symbol for Plutonium is Pu . This reactive metal has a bright silvery-gray appearance, similar to nickel. Plutonium is named after planet Pluto similar to its predecessor neptunium named after the planet Neptune. It was discovered in 1940 by scientists studying how to split atoms to make atomic bombs. What is Plutonium? The atomic number of plutonium is 94 and it is indicated by symbol is Pu. The first production reactor that made plutonium-239 was the X-10 Graphite Reactor, also known as the Clinton Pile, which went online in 1943 in Oak Ridge, TN. The complete detonation of a kilogram of plutonium produces an explosion equivalent to over 10,000 tonnes of chemical explosive. It is very sensitive to changes in temperature, pressure, or chemistry. It is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized. Plutonium production was essential for the Manhattan Project, and scientists at institutions throughout the country were competing with isotope separation methods to create it during 1942. It has an atomic weight around 244, a melting point of 640 degrees C (1183 degrees F), and a boiling point of 3228 degrees C (5842 degrees F). Plutonium oxide forms on the surface of plutonium … Pure plutonium metal is silvery-gray in appearance, but it glows red in the dark because it is pyrophoric. Plutonium is created in a reactor when uranium atoms absorb neutrons. It decays into uranium-240 through alpha decay. Plutonium is element atomic number 94 with element symbol Pu. Here are the properties of plutonium, according to the Los Alamos National Laboratory: Atomic number: 94; Atomic symbol: Pu; Atomic weight: 244; Melting point: … Plutonium is a radioactive chemical element and it is a member of group 3 and period 7 in the periodic table. Only two of plutonium's isotopes, plutonium-238 and plutonium-239, have found uses outside of basic research. It is a radioactive metal in the actinide series. Plutonium, isotope of mass 239 Plutonium dioxide (PuO 2) Plutonium hydride (PuH 2) Plutonium fluoride (PuF 3) Interesting facts: It is found in uranium ores. It is a solid metal with a silvery-grey appearance. Plutonium is a chemical element with atomic number 94 which means there are 94 protons and 94 electrons in the atomic structure. It is an actinide metal with a silvery-gray appearance but when oxidized it forms a dull coating. 15117-48-3. 239Pu. The electronic configuration of plutonium is [Rn] 5f 6 7s 2, and it shows four oxidation states. 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