actinoids (actinides)
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        A group of 15 radio-active elements whose electronic configura-tions display filling of the 5f level. As withthe lanthanoids,the first member,actini-um,has no f-electrons (Ac [Rn] 6d17s2)but other members also show deviationsfrom the smooth trend of f ele......（本文共 673 字）     [閱讀本文] >>