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Seaborgium (pronounced /siːˈbɔrgiəm/), also called eka-tungsten, is a chemical element in the periodic table that has the symbol Sg and atomic number 106. Seaborgium is a synthetic element whose most stable isotope 271Sg has a half-life of 2.4 minutes. Its chemistry probably resembles that of tungsten.
Element 106 was discovered almost simultaneously by two different laboratories. In June 1974, an American research team led by Albert Ghiorso at the Lawrence Radiation Laboratory at the University of California, Berkeley reported creating an isotope with mass number 263 and a half-life of 1.0 s, and in September 1974, a Soviet team led by G. N. Flerov at the Joint Institute for Nuclear Research at Dubna reported producing an isotope with mass number 259 and a half-life of 0.48 s,
Because their work was independently confirmed first, the Americans suggested the name seaborgium to honor the American chemist Glenn T. Seaborg credited as a member of the American team along with Ghiorso, J. M. Nitschke, J. R. Alonso, C. T. Alonso, M. Nurmia, E. Kenneth Hulet, and R. W. Lougheed in recognition of his participation in the discovery of several other actinides. The name selected by the team became controversial. An international committee decided in 1992 that the Berkeley and Dubna laboratories should share credit for the discovery.
An element naming controversy erupted and as a result IUPAC adopted unnilhexium (pronounced /ˌjuːn
There are 12 known isotopes of Seaborgium, the longest-lived of which is 271Sg which decays through alpha decay and spontaneous fission. It has a half-life of 2.4 minutes. The shortest-lived isotope is 258Sg which also decays through alpha decay and spontaneous fission. It has a half-life of 2.9 ms.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Seaborgium". A list of authors is available in Wikipedia.|