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23/09/2021 4:55 pm
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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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23/09/2021 4:59 pm
Answer is: (4) Fe2+, Mn2+
Explanation:
Total no. of e-
26Fe → 3d64s2, Fe+2 → 3d6 24
25Mn → 3d54s2, Mn+2 → 3d5 23