## Chemistry: A Molecular Approach (3rd Edition)

$[Ne]3s^{2}3p^{5}$ $[Ne]3s^{2}3p^{6}$ or $[Ar]$
Write the electron configuration for an uncharged O atom. Two electrons must be added to O to form the ion $O^{2-}$. Add these electrons to its energy level and change the corresponding electron configuration.