why Mn4+ is more stable than Mn2+
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Surely, Manganese will prefer to have an oxidation state of +2 than having an oxidation state of +4,even though the latter has a stable t2g configuration.
The main reason is that in Mn(II),the electronic configuration had no s electrons and have a highly stable half filled d orbital state, while in Mn (IV),2 s and d electrons are released forming a t2g configuration.
Surely, Half filled state is very much stable for an ion than in t2 g and eg configurations.
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