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Why are Mn^(2+) compounds more stable th...

Why are `Mn^(2+)` compounds more stable than `Fe^(2+)` compounds towards oxidation to their +3 state ?

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Electronic configuration of `Mn^(2+)` : `|Ar|3d^5` which is half-filled and hence stable configuration. Therefore 3rd lonization enthalpy is high i.e. `3^(rd)` electron cannot be lost easily. In case of `Fe^(2+)`, electronic configuration is `3d^6`. Hence it can lose one electron easily to give stable electronic configuration `3d^5`.
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