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 meit·ner·i·um /maɪtˈnɪrɪəm, ˈnɛr-/ 名詞

 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 Research Laboratory,
 Darmstadt, West Germany in 1982. Named in honor of Lise Meitner the
 Austrian physicist.