Assign oxidation states to each atom in each ion or compound.?


The basic rules for assigning oxidation states are:
The oxidation state of uncombined elements is always 0.
For a single ion, the oxidation state is the charge of the ion.
In compounds O is nearly always -2, H is nearly always +1.
The sum of oxidation states in a molecule or polyatomic ion add up to the charge.

Using those ideas:
In O2, O = 0
Li+ = +1
HgS: S = -2, Hg = +2
CO2: O = -2, C = +4
MnO42-(This should be MnO4^- and not 2-): With that being fixed, O = -2, Mn = +7
H2PO4-: O = -2, H = +1, P = +5

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