Given the neutral oxide, #Mn_3O_4#...what are the probable oxidation states of the manganese centres given that the metal expresses ONLY two oxidation states in this species?
The sum of the oxidation numbers equals the charge on the ion...
Of course, here, the parent species is NEUTRAL, and therefore the sum of the oxidation numbers EQUALS ZERO.
The oxidation number of oxygen, as oxide, is typically
The solid state structure does correspond to a formulation of