Textbook Problem

Write a Lewis structure for each of the following polyatomic ions. Show all bonding valence electron pairs as lines and all nonbonding valence electron pairs as dots. For those ions that exhibit resonance, draw the: various possible resonance forms.

msp;  $\begin{array}{l}\text{a}.\text{ sulfate ion},{\text{ SO}}_{\text{4}}{}^{\text{2}-}\\ \text{b}.\text{ phosphate ion},{\text{ PO}}_{\text{4}}{}^{\text{3}-}\\ \text{c}.\text{ sulfite ion},{\text{ SO}}_{\text{3}}{}^{\text{2}-}\end{array}$