Зная валентности атомов кислорода (O - II) и водорода (H - I), определите валентность других атомов в соединениях:
а) Na2O, CaO, Cu2O, N2O3
б) CH4, PH3, NaH, AlH3
в) NH3, P2O3, SO3, H2S, SiH4, SiO2
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