High Quality Content by WIKIPEDIA articles 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, unlike its lighter neighbours.
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