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actinides
锕系元素
元素周期表中原子序数为第89号锕至第103号铹这一组元素。包括锕(Ac)、钍(Th)、镤(Pa)、铀(U)、镎(Np)、钚(Pu)、镅(Am)、锔(Cm)、锫(Bk)、锎(Cf)、锿(Es)、镄(Fm)、钔(Md)、锘(No)、铹(Lr)共15种放射性元素。
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