Jisho

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じんこうほうしゃせいげんそ 人工放射性元素
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Noun
1. artificial radio-element​
Wikipedia definition
2. Synthetic element​In chemistry, a synthetic element is a chemical element that does not occur naturally on Earth, and can only be created artificially. So far 20 synthetic elements have been discovered — that is, synthesized. All are unstable, decaying with half-lives between years and milliseconds. Ten more elements were first created artificially but later discovered to exist naturally (in trace quantities) as well.
Read “Synthetic element” on English Wikipedia
Read “人工放射性元素” on Japanese Wikipedia
Read “Synthetic element” on DBpedia

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