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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: Electron configuration.... No, the electron configurations of an oxygen atom and an oxygen ion will be different, because the number of electrons will be different. Plus, it depends on what ion of oxygen you consider. Electron configuration of oxygen atom: 1s2, 2s2 2p4 Your teacher may be thinking about the hypothetical O^2- ion. It's electron configuration is: 1s2, 2s2 2p6