Question
$Mn ^{2+}$ is more stable than $Mn ^{4+}$. Why?
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Answer
1. The relative stability of different oxidation states of 3 d metals is correlated with the extra stability of half-filled and fully filled electronic configurations.
2. Example $- Mn ^{2+}\left(3 d^5\right)$ is more stable than $Mn ^{4+}\left(3 d^3\right)$
2. Example $- Mn ^{2+}\left(3 d^5\right)$ is more stable than $Mn ^{4+}\left(3 d^3\right)$
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