Seaborgium is a synthetic element with the symbol Sg and atomic number 106, whose most stable isotope 271Sg has a half-life of 1.9 minutes. A more recently discovered isotope 269Sg has a potentially slightly longer half-life (ca. 2.1 min) based on the observation of a single decay. Chemistry experiments with seaborgium have firmly placed it in group 6 as a heavier homologue to tungsten.

Discovery
Scientists working at the Joint Institute for Nuclear Research in Dubna, USSR reported their discovery of element 106 in June 1974. Synthesis was also reported in September 1974 at the Super HILAC accelerator at the Lawrence Berkeley Laboratory by a joint Lawrence Berkeley/Lawrence Livermore collaboration led by Albert Ghiorso and E. Kenneth Hulet.[7] They produced the new nuclide 263Sg by bombarding a target of 249Cf with 18O ions. 249Cf + 18O→263Sg This nuclide decays by α emission with a half-life of 0.9 ± 0.2 sec.

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