The seaborgium is a chemical element, of Sg symbol and Atomic number 106. It is a synthetic element whose Demi-vie of sound Isotope most stable Sg is of 30 second S.

History

Element 106 was discovered almost simultaneously by two different laboratories. In June 1974, a research team Soviet led by Georgii NR. Flerov to the Institut unified of nuclear research of Doubna paid to have produced an isotope of a Atomic mass of 259 and of a half-life of 7 ms. In September 1974, an American team directed by Albert Ghiorso in the Lawrence Radiation Laboratory with the Université of Berkeley paid to have created an isotope of mass 263 and a half-life of 0,9 S.

Since the work of the Americans was confirmed independently initially, those suggested like name seaborgium in the honor of the American chemist Glenn T. Seaborg. This name caused a great controversy because Seaborg was still alive. An international committee decided in 1992 that the laboratories of Berkeley and Doubna were to share the credit of discovered of element 106.

Meanwhile, UICPA adopted the name unnilhexium (Unh symbol) like provisional systematic name. In 1994, a committee of the UICPA recommended that the name Rutherfordium was adopted for element 104 and adopted a rule so that more no element is named in the honor of an alive person. The American chemical company (American Chemical Society) opposed this rule highly. In 1997, within the framework of a bearing compromise on the attribution of the names for elements 104 to 108, the name seaborgium was recognized internationally for element 106.

Isotopes

One knows twelve isotopes of the seaborgium, of which none is stable (see table opposite). Isotopes 259 Sg, 259 Sg, 259 Sg, 259 Sg and 259 Sg are not known and their numerical data are deduced from the total tendencies. Uncertainties are given between brackets.

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