Valency of nitrogen in N2O3
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3 is the valency of nitrogen in N2O3
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The key to this is twofold, the sum of the oxidation numbers for a compound will always be zero, and oxygen almost always has an oxidation number of -2.
NO --- +2
NO2 --- +4
N2O --- +1
N2O3 --- +3
N2O5 ---- +5
NO --- +2
NO2 --- +4
N2O --- +1
N2O3 --- +3
N2O5 ---- +5
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