Atomic number of `Mn, Fe, Co` and `Ni` are 25, 26, 27 and 28 respectively. Which of the following outer orbital octahedral complexes have same number

Monjur Alahi

Atomic number of `Mn, Fe, Co` and `Ni` are 25, 26, 27 and 28 respectively. Which of the following outer orbital octahedral complexes have same number of unpaired electrons ?
A. `[MnCl_(6)]^(3-)`
B. `[FeF_(6)]^(3-)`
C. `[CoF_(6)]^(3-)`
D. `[Ni(NH_(3))_(6)]^(2+)`


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Correct Answer - A::C
a,c are the correct answers.

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