# The atomic number of Mn, Fe,

Question:

The atomic number of Mn, Fe, Co and Ni are 25, 26 27 and 28 respectively.

Which of the following outer orbital octahedral complexes have the same number of unpaired electrons?

(i) [MnCl6]3–

(ii) [FeF6]3–

(iii) [CoF6]3–

(iv) [Ni(NH3)6]2+

Solution:

Option (i) and (iii) is the answer.