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Why is manganese more stable in the +2 state than in the +3 state and the reverse is true for iron? OR Why Mn2+ compounds are more stable than Fe2+ towards oxidation to their +3 state? |
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Answer» Electronic configuration of Mn2+ is [Ar] 3d5 which is half filled and hence it is stable. So third ionization enthalpy of manganese is very high i.e., third electron cannot be easily removed. Whereas, in case of Fe2+, the electronic configuration is [Ar] 3d6 . Therefore, Fe2+ can easily lose one electron to form Fe3+ (3d5) which is more stable as it is half-filled. Thus, manganese is more stable in the +2 state than in the +3 state and the reverse is true for iron. |
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