February 2023 1 8 Report
Визначте валентність усiх елементів у сполуках, формули яких наведено нижче, користуючись таблицею Д.I.Менделєєва: CaCl2;NaF; Mn2O7; Fe2O3; CuS; SO2; SiH4; SnO ; Cu(OH)2;Li3PO4 1​
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