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The transuranium (or transuranic) elements are the chemical elements with atomic number greater than 92, which is the atomic number of uranium. All of them are radioactively unstable and decay into other elements.
Glenn Theodore Seaborg (/ ˈ s iː b ɔːr ɡ / SEE-borg; April 19, 1912 – February 25, 1999) was an American chemist whose involvement in the synthesis, discovery and investigation of ten transuranium elements earned him a share of the 1951 Nobel Prize in Chemistry. [3]
Berkelium was the fifth transuranium element discovered after neptunium, plutonium, curium and americium. The major isotope of berkelium, 249 Bk, is synthesized in minute quantities in dedicated high-flux nuclear reactors , mainly at the Oak Ridge National Laboratory in Tennessee , United States, and at the Research Institute of Atomic Reactors ...
By 1966, thanks to support from Nobel Laureate Seaborg, co-discoverer of plutonium (the first transuranium element) and chairman of the Atomic Energy Commission, ORNL had designed, constructed and ...
A Nobel laureate who spearheaded the first discoveries of transuranium elements was Glenn Seaborg. In December 1940, his team working at the 60-inch cyclotron at the Lawrence Radiation Laboratory ...
The superheavy elements are those beyond the actinides in the periodic table; the last actinide is lawrencium (atomic number 103). By definition, superheavy elements are also transuranium elements, i.e., having atomic numbers greater than that of uranium (92).
Edwin Mattison McMillan (September 18, 1907 – September 7, 1991) was an American physicist credited with being the first to produce a transuranium element, neptunium.For this, he shared the 1951 Nobel Prize in Chemistry with Glenn Seaborg.
It was the sixth transuranium element to be discovered; the team announced its discovery on March 17, 1950. [29] [30] To produce californium, a microgram-size target of curium-242 (242 96 Cm) was bombarded with 35 MeV alpha particles (4 2 He) in the 60-inch-diameter (1.52 m) cyclotron at Berkeley, which produced californium-245 (245 98 Cf