Which of the following ions has electronic configuration [Ar]3d6? (At. nos. Mn = 25, Fe = 26, Co = 27, Ni = 28)

Question

Which of the following ions has electronic configuration [Ar]3d⁶?
(At. nos. Mn = 25, Fe = 26, Co = 27, Ni = 28)

Ni³⁺

Mn³⁺

Fe³⁺

Co³⁺

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