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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 this reason oxygen attracts electrons being an electronegative element. In the molecule H2O , the hydrogen can not give completely its electron but the electron is more far of the hydrogen and near the oxygen. this leads to a fictive fractional negative electric charge near oxygen and a fractional positive electric charge near the hydrogen. Source(s): maussy Â· 6 years ago.