4. Визначте валентність елементів у сполуках, поданих формулами: а) CO2, CH4, CO, Ca3P4: б) SO2, SO3, H2S, CuS; в) PCls, CCl4, HCI, Mn2O7; г) OF2, SC4, CaH2, Mg3P2. ДАЮ 60 БАЛІВ.
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