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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).
Therefore, oxygen needs to gain two electrons to add to its six. When electrons are added to a particle, there is an overall negative charge due to the imbalance between the positive (protons) and the negative (electrons). Negative ions are called anions. This means that in most cases oxygen forms a -2 ion (O2-).