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[" a.12The electronic configurations of ...

[" a.12The electronic configurations of bivalent "],[" europium and trivalent cerium are: "],[" (atomic number: "Xe=54,Ce=58,Eu=63" ) "],[" (atomic number: "Xe=54,Ce=58,Eu=63" ) "],[" 2.[Xe] "4f^(2)" and [Xe] "4f'],[" 2."[Xe]4f^(7)" and "[Xe]4f'],[" 3."[Xe]4f^(4)" and "[Xe]4f^(9)],[" 4.[Xe] "4f^(7)6s^(2)" and "[Xe]4f^(2)6s^(2)]

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