From the following pairs of ions which one is not an iso-electronic pair ? (A) O2–, F – (B) Na+, Mg2+ (C) Mn2+, Fe3+ (D) Fe2+, Mn2+

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Question

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

(A) O2–, F –
(B) Na+, Mg2+
(C) Mn2+, Fe3+
(D) Fe2+, Mn2+

Prashant Kotian · Accepted Answer

Correct answer: D. Total no. of e– 26Fe ® 3d64s2, Fe+2 ® 3d6 24 25Mn ® 3d54s2, Mn+2 ® 3d5 23

💡 Solution & Explanation