Question

Mn2+ is much more resistant than fe2+ towards oxidation

Answer 1

As Mn2+ has half filled stabilisation ( due to exchange energy) it is very reluctant to accept electeons.This is why Mn2+ is much more resistant than Fe2+

Answer 2

Reason for $Mn^2^+$ is much more resistant than $Fe^2^+$towards oxidation:

• The 'Electronic Configuration' of $Mn^2^+$ is 18 [Ar]$3d^5$, which is a stable configuration.

• Because d orbitals are 'half-filled' whereas the Electronic Configuration of $Fe^2^+$ is 18 [Ar]$3d^6$, which is not a stable configuration and hence $Fe^2^+$  is less stable compared to $Mn^2^+$.

• So, $Mn^2^+$ does not allow the release of electrons easily and more resistant than $Fe^2^+$, which can release its outermost electron to form stable compounds.

• $Fe^2^+$ will lose single electron quickly to form a  stable configuration.

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