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From the following pairs of ions which one is not an iso-electronic pair?

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From the following pairs of ions which one is not an iso-electronic pair?

(1) O2–, F

(2) Na+, Mg2+

(3) Mn2+, Fe3+

(4) Fe2+, Mn2+

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Answer is: (4) Fe2+, Mn2+

Explanation:

                                Total no. of e-

26Fe → 3d64s2, Fe+2 → 3d6    24

25Mn → 3d54s2, Mn+2 → 3d5    23

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