Определить валентность химических элементов в следующих соединениях: Li2O,CaO,NiO,Ni2O3,CO,CoO,Co2O3,CO2,WO3,P2O5,F2O,CaCl2,MgBr2,Cl2O,Fe2O3,H2Se,PH3,SiH4,Al4C3,NH3,HF,l2O5,Mn2O7,Na2O,CuO,BaH2.
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