SPECTRUM

Chemical Fact Sheet

Seaborgium

Chemical Abstract Number (CAS #) 54038-81-2
Analytical Methods 200.8 - 6020
Atomic Symbol Sg

Synopsis from the CRC Handbook of Chemistry and Physics 92nd Edition 2011-2013

Seaborgium — (Glenn T. Seaborg [1912–1999], American chemist and nuclear physicist). Sg; at. wt. [266]; at no. 106. The discovery of Seaborgium, Element 106, took place in 1974 almost simultaneously at the Lawrence-Berkeley Laboratory and at the Joint Institute for Nuclear Research at Dubna, Russia. The Berkeley Group, under direction of Ghiorso, used the Super- Heavy Ion Linear Accelerator (Super HILAC) as a source of heavy 18O ions to bombard a 259-μg target of 249Cf. This resulted in the production and positive identification of 263106, which decayed with a half-life of 0.9 ± 0.2 s by the emission of alpha particles as follows: 263106 α→259 104α→255 Noα→ The Dubna Team, directed by Flerov and Organessian, produced heavy ions of 54Cr with their 310-cm heavy-ion cyclotron to bombard 207Pb and 208Pb and found a product that decayed with a half-life of 7 ms. They assigned 259106 to this isotope. It is now thought seven isotopes of Seaborgium have been identified. Two of the isotopes are believed to have halflives of about 30 s. Seaborgium most likely would have properties resembling tungsten. The IUPAC adopted the name Seaborgium in August 1997. Normally the naming of an element is not given until after the death of the person for which the element is named; however, in this case, it was named while Dr. Seaborg was still alive.

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