Chapter 5, Problem 78AP

For the following pairs of ions, use the principle of electrical neutrality to predict the formula of the binary compound that the ions are most likely to form.

1. ${\text{Na}}^{+}{\text{and S}}^{2-}$  e. ${\text{Cu}}^{2+}{\text{and Br}}^{-}$

   ${\text{K}}^{+}{\text{and Cl}}^{-}$  f. ${\text{Al}}^{3+}{\text{and I}}^{-}$

   ${\text{Ba}}^{2+}{\text{and O}}^{2-}$  g. ${\text{Al}}^{3+}{\text{and O}}^{2-}$

   ${\text{Mg}}^{2+}{\text{and Se}}^{2-}$  h. ${\text{Ca}}^{2+}{\text{and N}}^{3-}$