Определить валентность в бинарных соединениях
CaO, SiO2 , CuO , Cu2O , FeO, Fe2O3, SiH4, CrO3, H2S, CO2, CO, SO3, SO2, HCl, HBr, Cl2O5,
Cl2O7, РН3, K2O, Al2O3, P2O5, NO2, N2O5, Cr2O3, SiO2, B2O3, SiH4, Mn2O7, MnСI2, N2O3.
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