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Physical Properties of Boron Family

Why are Mn 2+...

Question

Why are Mn²⁺compounds more stable than Fe²⁺ towards oxidation to their +3 state?

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Solution

Electronic configuration of Mn²⁺ is [Ar]¹⁸3d⁵.

Electronic configuration of Fe²⁺ is [Ar]¹⁸3d⁶.

It is known that half-filled and fully-filled orbitals are more stable. Therefore, Mn in (+2) state has a stable d⁵ configuration. This is the reason Mn²⁺ shows resistance to oxidation to Mn³⁺. Also, Fe²⁺ has 3d⁶ configuration and by losing one electron, its configuration changes to a more stable 3d⁵ configuration. Therefore, Fe²⁺ easily gets oxidized to Fe⁺³ oxidation state.

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