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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).
For example, carbon is in group 4 and has 4 valence electrons. Oxygen is in group 6 and has 6 valence electrons. For charged atoms, there is a deviation from the normal number of valence electrons. The charge on an atom tells you how much of a deviation there is from an elementâs normal valence number.