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Answer Wiki. The ionic charge of oxygen is -2. You can tell because oxygen is in group number 6, so it has 6 valence electrons. Since it needs 2 more electrons to become neutral with a full outer shell of 8 electrons, its charge is -2 (since adding electrons gives a negative charge).
Answers. Best Answer: My answers were: S in H2SO3 is 4+ S in MgSO4 is 6+ and S in K2S is 2- For the first one, hydrogen has an oxidation number of 1+ per atom. There are 2 hydrogen atoms in that compound so the overall charge of hydrogen is 2+. The oxidation number of oxygen is 2- per atom, and having 3 atoms of oxygen the overall charge of oxygen is 6- so combine the charges.