2005/01/13 | 钷[Promethium]
类别(℃〖化学〗) | 评论(1) | 阅读(103) | 发表于 13:12
An element which is not found naturally on Earth. It has been found in the star HR465 in Andromeda, where it must have formed extremely recently, since none of its isotopes has a half life longer than 17.7 years.
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