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The electronic configuration for the oxygen atom is [math]1s^2 2s^2 2p^4[/math]. It must acquire 2 electrons to become an ion with a charge of -2 . Thus the electronic configuration for an [math]O^{2 -}[/math] ion is
Best Answer: All atoms are neutral. An oxygen atom is neutral. The oxygen molecule, O2 is neutral. The oxygen ion has taken on 2 additional electrons from another atom to become the O^-2 ion. Oxygen, from column 6 has 8 electrons, 2 in the first energy level[now that level is full] and 6 in the outer energy level.