Meitnerium ( /maɪtˈnɪəriəm/ myt-NEER-ee-əm or /maɪtˈnɜriəm/ myt-NUR-ee-əm) 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...
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Meitnerium ( /maɪtˈnɪəriəm/ myt-NEER-ee-əm or /maɪtˈnɜriəm/ myt-NUR-ee-əm) 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 Mt, with a half-life of ~8 s.
Meitnerium was first synthesized on August 29, 1982 by a German research team led by Peter Armbruster and Gottfried Münzenberg at the Institute for Heavy Ion Research (Gesellschaft für Schwerionenforschung) in Darmstadt. The team bombarded a target of bismuth-209 with accelerated nuclei of iron-58 and detected a single atom of the isotope meitnerium-266:
Meitnerium was formerly known as unnilennium, bearing the symbol Une....
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