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

8.2     Why are Mn^{2+} compounds more stable than Fe^{2+} towards oxidation to their +3 state?

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Mn^{2+}= 1s^2,2s^2p^6,3s^2p^6d^5\:\:\:(Half\:filled \:d-orbital)

Fe^{2+}= 1s^2,2s^2p^6,3s^2p^6d^6

In +2 oxidation state of manganese has more stability than +2 oxidation state of iron, it is because half filled and fully filled d-orbitals are more stable and Mn^{2+}has half filled electron stability Manganese (Mn^{2+}) has d^{5} configuration so it wants to remain in this configuration. On the other hand, Fe^{2+}has d^{6} configuration and after losing one electron it becomesd^{5} configuration and attains its stability. That's why Mn^{2+} compounds more stable than Fe^{2+} towards oxidation to their +3 state.

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manish

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