Which of the following ions has electronic configuration $[Ar]3d^6$ ?
(At. nos. $Mn = 25, Fe = 26, Co = 27, Ni = 28$)
(At. nos. $Mn = 25, Fe = 26, Co = 27, Ni = 28$)
- A$Ni^{3+}$
- B$Mn^{3+}$
- C$Fe^{3+}$
- D$Co^{3+}$
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