We know that most of the ores of many metals are oxides and sulphides. This is why oxygen-sulphur (16-group) group is called chalcogen family. (Chalcoore, genus produce).
We know that most of the ores of many metals are oxides and sulphides. This is why oxygen-sulphur (16-group) group is called chalcogen family. (Chalcoore, genus produce).