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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
Construct a Molecular orbital diagram for the O 2 molecule. There are six valence electrons on a neutral oxygen atom and therefore 12 valence electrons in an O 2 molecule. These electrons are added to the diagram in the figure below, one at a time, starting with the lowest energy molecular orbital.