meitnerium


meitnerium
meitnerium [mīt nir′ē əm]
n.
ModL, after MEITNER Lise + -IUM
a radioactive chemical element with a very short half-life: a transactinide produced by bombarding bismuth with high-energy nuclear particles: symbol, Mt; at. no., 109: see the periodic table of elements in the Reference Supplement

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meit·ner·i·um (mīt-nûrʹē-əm) n. Symbol Mt
An artificially produced radioactive element with atomic number 109 whose most long-lived isotopes have mass numbers of 266 and 268 with half-lives of 3.4 milliseconds and 70 milliseconds, respectively. Also called unnilennium. See table at element.
  [After Meitner, Lise.]

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 an artificially produced element belonging to the transuranium group, atomic number 109. It is predicted to have chemical properties resembling those of iridium.

      In 1982 West German physicists at the Institute for Heavy Ion Research (Gesellschaft für Schwerionenforschung [GSI]) in Darmstadt synthesized an isotope of meitnerium with a mass number of 266. Using a high-energy linear accelerator, the GSI investigators, under the direction of Peter Armbruster, bombarded bismuth-209 targets with beams of iron-58 ions for roughly 10 days. The resultant fusion reaction between the bismuth and iron atoms yielded only a single nucleus of the new element; however, the sensitivity of the detection technique employed left little doubt as to the validity of the identification. Meitnerium has an estimated half-life between 2 and 20 milliseconds.

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Universalium. 2010.

Look at other dictionaries:

  • Meitnerium — Meitnérium Pour les articles homonymes, voir Mt. Meitnérium …   Wikipédia en Français

  • meitnerium — ● meitnerium nom masculin (de L. Meitner, nom propre) Élément chimique artificiel (Mt), de numéro atomique 109 et de masse atomique voisine de 268 …   Encyclopédie Universelle

  • meitnerium — Symbol: Mt Atomic number: 109 Atomic weight: (266) Half life of approximately 5ms. The creation of this element demonstrated that fusion techniques could indeed be used to make new, heavy nuclei. Made and identified by physicists of the Heavy Ion …   Elements of periodic system

  • meitnerium — [mīt nir′ē əm] n. [ModL, after MEITNER Lise + IUM] a radioactive chemical element with a very short half life: a transactinide produced by bombarding bismuth with high energy nuclear particles: symbol, Mt; at. no., 109: see the periodic table of… …   English World dictionary

  • Meitnerium — hassium ← meitnerium → darmstadtium Ir ↑ Mt ↓ (Upe) …   Wikipedia

  • Meitnérium — Pour les articles homonymes, voir Mt. Meitnérium Hassium ← Meitnérium → …   Wikipédia en Français

  • Meitnerium — Eigenschaften …   Deutsch Wikipedia

  • Meitnerium — meitneris statusas T sritis fizika atitikmenys: angl. meitnerium vok. Meitnerium, n rus. мейтнерий, m pranc. meitnerium, m …   Fizikos terminų žodynas

  • Meitnerium — Meit|ne|ri|um [nach der österr. Physikerin L. Meitner (1878–1968); ↑ ium (1)], das; s; Symbol: Mt; früherer systematischer Name: Unnilennium (Une): nur künstlich herstellbares, radioaktives chem. Element (Transactinid) aus Gruppe 9 des… …   Universal-Lexikon

  • meitnerium — meit·ner·i·um mīt nir ē əm, ner n a short lived radioactive element that is artificially produced symbol Mt see element (table) Meit·ner mīt nər Lise (1878 1968) German physicist. One of the first women to pursue a career in physics, Meitner… …   Medical dictionary


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