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Dawn Angela Shaughnessy is an American radiochemist and principal investigator of the heavy element group at the Lawrence Livermore National Laboratory. [3] She was involved in the discovery of five superheavy elements with atomic numbers 114 to 118.
Superheavy elements, also known as transactinide elements, transactinides, or super-heavy elements, or superheavies for short, are the chemical elements with atomic number greater than 104. [1] The superheavy elements are those beyond the actinides in the periodic table; the last actinide is lawrencium (atomic number 103).
Despite these unsuccessful attempts to observe long-lived superheavy nuclei, [34] new superheavy elements were synthesized every few years in laboratories through light-ion bombardment and cold fusion [k] reactions; rutherfordium, the first transactinide, was discovered in 1969, and copernicium, eight protons closer to the island of stability ...
In 1996, the Russian team proposed the name becquerelium after Henri Becquerel. [59] The American team in 1997 proposed the name hahnium [60] after Otto Hahn (previously this name had been used for element 105). The name darmstadtium (Ds) was suggested by the GSI team in honor of the city of Darmstadt, where the element was discovered.
This name had been used in books of the Soviet Bloc as the official name of the element. The Americans, however, proposed rutherfordium (Rf) for the new element to honor New Zealand physicist Ernest Rutherford , who is known as the "father" of nuclear physics . [ 58 ]
Although the IUPAC systematic names are widely used in the chemical community on all levels, from chemistry classrooms to advanced textbooks, scientists who work theoretically or experimentally on superheavy elements typically call it "element 120", with the symbol E120, (120) or 120. [1]
Though particular details may remain unclear or controversial, at minimum it is certain that Victor Ninov made a "wrongful claim" about elements 116 and 118. [11] The superheavy elements 116 and 118 were eventually discovered and verified in the Joint Institute for Nuclear Research in Dubna, Russia from 2000–2002. [12]
Super Heavy or Superheavy may refer to: Superheavy element; SuperHeavy, a supergroup band, 2009–2011 SuperHeavy, the single 2011 album released by the band SuperHeavy; SpaceX Super Heavy, the reusable first stage of the SpaceX Starship launch vehicle; Super-heavy tank; Super heavy-lift launch vehicle, the most capable class of orbital rockets