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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).
The result is oxygen and nitrogen atoms that are positively charged because they are short one electron AP226 Comparison of Photoionization Detectors : (1) Ionization potential of noble gases (group zero) is very high due to The first ionization energy of oxygen (O2) is smaller than nitrogen (N2).