A common Lewis bookkeeping form draws three Mn=O bonds and one Mn–O⁻ bond, with four equivalent placements. This is useful for formal-charge exercises but is not a complete orbital description of Mn–O bonding.
Reviewed July 16, 2026 · Model limitation stated explicitly
Mn contributes 7, four O contribute 24 and the negative charge adds 1: 32 electrons.
Four oxygen positions around manganese give tetrahedral geometry.
In the displayed contributor, the single-bonded oxygen carries −1.
Formal Lewis structures are much less complete for transition-metal compounds than for ordinary second-period covalent molecules. The displayed bond orders are electron-bookkeeping conventions and should not be read as a full molecular-orbital treatment.