You may find bellow the assignment of the oxidation number for each atom.
Explanation:
Li₃PO₄
Li have the oxidation number +1
P have the oxidation number +5
O have the oxidation number -2
SO₃²⁻
S have the oxidation number +4
O have the oxidation number -2
Cr₂S₃
Cr have the oxidation number +3
S have the oxidation number -2
NO₃⁻
N have the oxidation number +5
O have the oxidation number -2
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oxidation number
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