Определите степени окисления атомов в соединениях:

а) Na2S, Na3N, NaBr, MgCl2, MgS, Mg3N2, Al2S3, Al2O3;

б) N2O, NH3, NO2, N2O3, N2O5, SO3, SO2, H2S, Fe2O3, FeO

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