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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 â8+â refers to the atomic number of oxygen, which is also the number of protons in the nucleus and number of electrons in the energy levels outside the nucleus. For the oxygen atom, 2 electrons are in the first energy level and the remaining 6 electrons are in the next or second energy level.