• # question_answer2) Write the Lewis structure of the nitrite ion, $NO_{2}^{-}$.

Nitrogen has five valence electrons and each oxygen atom has six valence electrons. Total valence electrons available = 5 + 2 x 6 + 1 (negative charge) = 18 The skeletal structure of $NO_{2}^{-}$ is: $O\,\,\,N\,\,\,O$ Total number of electrons needed by all the atoms to achieve noble gas configuration $=3\times 8=24$ Thus, number of electrons shared = 24 18 = 6 i.e., there are three bonds between the atoms.