A) $ [Ar],3d^{5} $
B) $ [Ar],3d^{7} $
C) $ [Ar],3d^{3} $
D) $ [Ar],3d^{8} $
Correct Answer: A
$ Fe_{26}=[Ar],3d^{6}4s^{2} $
$ F{e^{3+}}=[Ar],3d^{5}4s^{0}. $
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