We use our knowledge of valance electrons to determine what he formal charge of the molecule will be.
Easiest formal charge formula you will find anywhere on the internet:
The Net Charge is the sum of all the formal charges on a molecule.
Example: Calculate the formal charges of ALL atoms.3m
Example: Calculate the formal charges of ALL atoms.2m
Hell yeah! That’s literally all there is to know. Don’t let any professors complicate it more for you.