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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
Use the position in the periodic table and electron configuration to describe the chemical properties of Calcium and Oxygen. Calcium is located in Group 2, and has 2 valence electrons. Oxygen is located in Group 16, and has 6 valence electrons.