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

$1s^{2}$$2s^{2}$$2p^{4}$ $1s^{2}$$2s^{2}$$2p^{6}$ or $[Ne]$
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.