揭示大自然的规律
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钷[Promethium]
 
 
 
℃〖化学〗
2005-1-13 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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