Meitnerium

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Meitnerium (play /mtˈnɪəriəm/ myt-NEER-ee-əm or /mtˈnɜriəm/ 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, unlike its lighter neighbours.

It was first synthesized in 1982 and several isotopes are currently known. The heaviest and the most stable isotope known is Mt-278, with a half-life of ~8 s.

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