We are asked to draw a Lewis structure that makes the formal charge on the central atom equal to zero.
We are given that 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
To do so, we need to do the following steps:
Step 1: Determine the number of valence electrons and the identity of X.
Step 2: Determine the formal charge of X.
Step 3: Draw the Lewis structure for the molecule.
Step 4: Draw the Lewis structure that makes the formal charge on the central atom equal to zero.
Recall that the formula for the formal charge is:
For each of these ions draw a Lewis structure that makes the formal charge on the central atom equal to zero.
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