Jisho

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同位体
Wikipedia definition
1. Isotopes of ununoctiumUnunoctium (Uuo) is an artificial element, and thus a standard atomic mass cannot be given. Like all artificial elements, it has no stable isotopes. The first (and so far only) isotope to be synthesized was Uuo in 2006. All data are hypothetical. Its sole known isotope has a half-life of 890 microseconds.
Read “Isotopes of ununoctium” on English Wikipedia
Read “ウンウンオクチウムの同位体” on Japanese Wikipedia
Read “Isotopes of ununoctium” on DBpedia

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