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Meitnerium


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  • Variants

    • Eka-iridium
    • Unnilennium
  • Broader Terms

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  • Sources

    • found: Hall, L.E. The transactinides : rutherfordium, dubnium, seaborgium, bohrium, hassium, meitnerium, darmstadtium, roentgenium, 2012:p. 23 (Element 109, meitnerium)
    • found: Angulo, I. Seaborgium, bohrium, hassium, meitnerium, darmstadtium, roentgenium, and copernicium (chemistry and applications), 2012.
    • found: The element meitnerium, via It's elemental website, Sept. 27, 2012(Meitnerium; Mt; Atomic Number: 109; Atomic Weight: 278; Element Classification: Metal; Period Number: 7; Group Number: 9; Group Name: none; Radioactive and Artificially Produced)
    • found: ChemicalElements.com, Sept. 27, 2012(Meitnerium. Symbol: Mt. Atomic Number: 109. Atomic Mass: (266.0) amu. Number of Protons/Electrons: 109. Number of Neutrons: 157. Classification: Transition Metal. Other Names: Unnilennium (Une))
    • found: Meitnerium element facts, via Chemicool website, Sept. 27, 2012(Meitnerium was first synthesized by research scientists led by Peter Armbruster and Gottfried Münzenber at the Heavy Ion Research Laboratory in Darmstadt, Germany in 1982. They bombarded bismuth-209 with accelerated iron-58 nuclei. The element was named after physicist and mathematician Lise Meitner. Classification: Meitnerium is a transition metal. Meitnerium is a synthetic, radioactive metal and has only been produced in tiny amounts.)
    • found: Wikipedia, Sept. 27, 2012(Meitnerium is a chemical element with the symbol Mt and atomic number 109. It is placed as the heaviest member of group 9 (or VIII) in the periodic table but a sufficiently stable isotope is not known at this time which would allow chemical experiments to confirm its position as a heavier homologue to iridium, unlike its lighter neighbors. It was first synthesized in 1982 and several isotopes are currently known. The heaviest and the most stable isotope known is ²⁷⁸Mt, with a half-life of ~8 s; formerly known as unnilennium, bearing the symbol Une. Historically, meitnerium has been referred to as eka-iridium; super-heavy elements such as meitnerium; Element category: unknown, but probably a transition metal)
    • found: Hahn, O. Zur Frage nach der Existenz der "Trans-Urane" : 1. endgültige Streichung von Eka-Iridium, 1939.
    • found: The American heritage dictionary of the English language, ©2000, via TheFreeDictionary.com, Sept. 27, 2012(meitnerium Symbol Mt An artificially produced radioactive element with atomic number 109 that has known isotopes with mass numbers ranging from 265 to 279. The isotope with the longest confirmed half-life (0.7 seconds) is Mt 268. Also called unnilennium)
    • found: TheFreeDictionary thesaurus, Sept. 27, 2012(meitnerium - a radioactive transuranic element: atomic number 109, element 109, Mt)
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  • Change Notes

    • 2012-09-28: new
    • 2013-01-24: revised
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