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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What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Formal Charge concept. You can view video lessons to learn Formal Charge. Or if you need more Formal Charge practice, you can also practice Formal Charge practice problems.
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