Jisho

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同位体
Wikipedia definition
1. Isotopes of ununseptiumUnunseptium (Uus) is the most-recently synthesized artificial element, and much of the data is hypothetical. As any artificial element, a standard atomic mass cannot be given. Like all artificial elements, it has no stable isotopes. The first (and so far only) isotopes to be synthesized were Uus and Uus in 2009. The longer-lived isotope is Uus with a half-life of 78 ms.
Read “Isotopes of ununseptium” on English Wikipedia
Read “ウンウンセプチウムの同位体” on Japanese Wikipedia
Read “Isotopes of ununseptium” on DBpedia

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