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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.
I, and transuranium elements as the targets for transmutation, with other fission products, activation products, and possibly reprocessed uranium remaining as waste. [21] Technetium-99 is also produced as a waste product in nuclear medicine from Technetium-99m , a nuclear isomer that decays to its ground state which has no further use.
Zachariasen's X-ray diffraction analysis was an essential basis for experimental evidence that the transuranium elements formed a 5f series analogous to the 4f series of the rare-earth elements. His X-ray studies of the transuranium elements were essential for the development of the metallurgy of the transuranium elements, particularly ...
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.
So, element 105 was named dubnium, and element 106 was named seaborgium. The elements were placed in the periodic table’s seventh row, which is above the row of lanthanides and the row of actinides.
The existence of transuranium elements was suggested in 1934 by Enrico Fermi, based on his experiments. [ 12 ] [ 13 ] However, even though four actinides were known by that time, it was not yet understood that they formed a family similar to lanthanides.
It is an actinide element, the sixth transuranium element to be synthesized, and has the second-highest atomic mass of all elements that have been produced in amounts large enough to see with the naked eye (after einsteinium). It was named after the university and the U.S. state of California.