| 释义 |
meitnerium meit.ner.i.um AHD: [mºt-nûr“¶-…m] D.J. [ma!t6nT8ri8*m]K.K. [ma!t6nPri*m]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语源:After Meitner Lise After Meitner Lise |