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Question
Q158) Which one of the following ions has electronic configuration [Ar]3d6?
(At. nos. Mn = 25, Fe = 26, Co = 27, Ni = 28)



SOLUTION

Electronic configuration [Ar]3d63+ have 24 electrons Ni3+ = 28 – 3 have 24 electrons Mn3+ = 25 – 3 have 24 electrons Fe3+ = 26 – 3 have 24 electrons
Answer:(a)