Which one of the following ions has electronic configuration[Ar] 3d⁶?

Which One Of The Following Ions Has Electronic Configurationar 3d Chemistry QuestionWhich One Of The Following Ions Has Electronic Configurationar 3d Chemistry Question

Which one of the following ions has electronic configuration[Ar] 3d⁶? (At. no: Mn=25, Fe=26, Co=27, Ni=28)

Options

(a) Ni³⁺
(b) Mn³⁺
(c) Fe³⁺
(d) Co³⁺

Correct Answer:

Co³⁺

Explanation:

Ni³⁺ (28) = [Ar] 3d⁷
Mn³⁺ (25) = [Ar] 3d⁴
Fe³⁺ (26) = [Ar] 3d⁵
Co³⁺ (27) = [Ar] 3d⁶

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