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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).
1 For ions, the oxidation number is equal to their charge. 2  For single hydrogen, the number is usually +1 but in some cases it is -1. 3  For oxygen, the number is usually -2.  The sum of the oxidation number (ONs) of all the atoms in the molecule or ion is equal to its total charge.