Why is the metallic atom in low oxidation state in metallic carbonyls?

The Metal atom in metal carbonyls is in low oxidation state. This is because of the fact that there is a higher electron density ( electronic charge) on the metal atom in its lower oxidation state than in its higher oxidation state. Thus, since the metal is electropositive in nature, it would feel more comfortable, if some of the excess electronic charge present on the metal atoms gets transferred to the π-orbitals of CO (legand) by forming M →CO π-bond.

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