seaborgium [sē bôr′gē əm]
ModL, after SEABORG Glenn T(heodore) + -IUM
a radioactive chemical element with a very short half-life: a transactinide produced by bombarding californium or lead with high-energy nuclear particles: symbol, Sg; at. no., 106: see the periodic table of elements in the Reference Supplement

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sea·bor·gi·um (sē-bôrʹgē-əm) n. Symbol Sg
An artificially produced radioactive element with atomic number 106 whose most long-lived isotopes have mass numbers 259, 261, 263, 265, and 266 with half-lives of 0.9, 0.23, 0.8, 16, and 20 seconds, respectively. Also called unnilhexium. See table at element.
  [After Seaborg, Glenn Theodore.]

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 an artificially produced radioactive element in Group VIb of the periodic table, atomic number 106. In June 1974, Georgy N. Flerov of the Joint Institute for Nuclear Research at Dubna, Russia, U.S.S.R., announced that his team of investigators had synthesized and identified element 106. In September of the same year, a group of American researchers headed by Albert Ghiorso at the Lawrence Radiation Laboratory (now Lawrence Berkeley Laboratory) of the University of California at Berkeley reported their synthesis of the identical element. Disagreement arose between the two groups over the results of their experiments, both having used different procedures to achieve the synthesis. The Soviet scientists had bombarded lead-207 and lead-208 with ions of chromium-54 to produce an isotope of element 106 having a mass number of 259 and decaying with a half-life of approximately 0.007 second. The American researchers, on the other hand, had bombarded a heavy radioactive target of californium-249 with projectile beams of oxygen-18 ions, which resulted in the creation of a different isotope of element 106—one with a mass number of 263 and a half-life of 0.9 second. Russian researchers at Dubna reported their synthesis of two isotopes of the element in 1993, and a team of researchers at Lawrence Berkeley duplicated the Ghiorso group's original experiment that same year. In honour of the American nuclear chemist Glenn T. Seaborg, American researchers tentatively named the element seaborgium, which was later ratified by the International Union of Pure and Applied Chemistry. Based on its position in the periodic table, seaborgium is thought to have chemical properties akin to those of tungsten.

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Universalium. 2010.

Look at other dictionaries:

  • Seaborgium — (pronEng|siːˈbɔrgiəm) is a chemical element in the periodic table that has the symbol Sg and atomic number 106, Image of Seaborgium . Seaborgium is a synthetic element whose most stable isotope 271Sg has a half life of 1.9 minutes. Chemistry… …   Wikipedia

  • Seaborgium — Dubnium ← Seaborgium → Bohrium W …   Wikipédia en Français

  • seaborgium — ● seaborgium nom masculin (de G. T. Seaborg, nom propre) Élément chimique artificiel (Sg) de numéro atomique 106, de masse atomique 263,1186 …   Encyclopédie Universelle

  • seaborgium — Name proposed for the 106th element (unnilhexium) by the American Chemical Society in honor of Gleen T. Seaborg, an American nuclear physicist and Nobel prize winner …   Elements of periodic system

  • seaborgium — [sē bôr′gē əm] n. [ModL, after SEABORG Glenn T(heodore) + IUM] a radioactive chemical element with a very short half life: a transactinide produced by bombarding californium or lead with high energy nuclear particles: symbol, Sg; at. no., 106:… …   English World dictionary

  • Seaborgium — Eigenschaften …   Deutsch Wikipedia

  • Seaborgium — siborgis statusas T sritis fizika atitikmenys: angl. seaborgium vok. Seaborgium, n rus. сиборгий, m pranc. seaborgium, m …   Fizikos terminų žodynas

  • seaborgium — siborgis statusas T sritis chemija apibrėžtis Cheminis elementas. simbolis( iai) Sg atitikmenys: lot. seaborgium angl. seaborgium rus. сиборгий …   Chemijos terminų aiškinamasis žodynas

  • seaborgium — noun Etymology: New Latin, from Glenn T. Seaborg Date: 1994 a short lived radioactive element that is produced artificially see element table …   New Collegiate Dictionary

  • seaborgium — noun A transuranic chemical element (symbol Sg) with atomic number 106 Syn: eka tungsten, rutherfordium, unnilhexium …   Wiktionary

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