September 2021 1 22 Report
визначте валентність елементів у сполуках:
а) HCl, PH 3 , NH 3 , SiH 4 , H 2 S, HBr;
б) ZnO, H 2 O, PbO 2 , SO 3 , K 2 O, BaO, SiO 2 , Cr 2 O 3 , NO, NO 2 , N 2 O;
в) Al 2 S 3 , CS 2 , FeS, Na 2 S, K 2 S, MgS, CuS.
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