# What bonds occur in sulfate ion?

We could write a Lewis representation of $S {O}_{4}^{2 -}$ as ${\left(O =\right)}_{2} S {\left(- O\right)}_{2}^{2 -}$, or of the $\text{parent acid}$ as ${\left(O =\right)}_{2} S {\left(- O H\right)}_{2}$. This is a bit old-fashioned, and some representations give $\stackrel{2 +}{S} {\left(- {O}^{-}\right)}_{4}$, but it is still $S {O}_{4}^{2 -}$.
And typical sulfate salts are $N {a}_{2} S {O}_{4}$, $C a S {O}_{4}$, $F e S {O}_{4}$, and $B a S {O}_{4}$.