Consider the Lewis structure for the polyatomic oxyanion shown here, where X is an element from the

Question:

Consider the Lewis structure for the polyatomic oxyanion shown here, where X is an element from the third period (Na --- Ar). By changing the overall charge, n, from 1 -- to 2 --- to 3 --- we get three different polyatomic ions. For each of these ions
(a) Identify the central atom, X;
(b) Determine the formal charge of the central atom, X;
(c) Draw a Lewis structure that makes the formal charge on the central atom equal to zero.