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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
In order to write shorthand electron configurations you need to know how to use the periodic table to write electron configurations. Groups 1 and 2 are the s-block elements, groups 3-12 are the d-block elements, groups 13-18 are the p-block elements.