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Which of the listed electronic configurations corresponds to Fe^3+ion

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Which of the listed electronic configurations corresponds to Fe3+ion

А.  [Ar] 3d5 4s0

B.  [Ar] 3d3 4s2

C.  [Ar] 3d5 4s1 4p1

D.  [Ar] 3d3 4s1 4p1

E.  [Ar] 3d4 4s1

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А.  [Ar] 3d5 4s0  

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