| 释义 |
meit·ner·i·um AHD[mīt-nûrʹē-əm] D.J.[maɪtˈnɜːriːəm]K.K.[maɪtˈnɝriəm]n.Symbol Mt （名词）符号 Mt - An artificially produced radioactive element with atomic number 109 whose most long-lived isotopes have mass numbers of 266 and 268 with half-lives of 3.4 milliseconds and 70 milliseconds, respectively. Also called unnilennium ：人工产生的放射性元素，原子序数号为109，生命期最长同位素的质量为266和268，半衰期分别为3.4毫秒和70毫秒 也作 unnilennium
- After Meitner Lise After Meitner Lise
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