(Polar molecules, Non-polar molecules, etc.)
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You are trying to make all the formal charges of each element equal to 0. Of course, if the compound as a whole has a negative or positive charge, at least one of them have to have a charged. When that happens, put the negative charge on the more electronegative one.
Last edited by Minh Ngo 4G on Mon Dec 02, 2019 11:36 pm, edited 1 time in total.
Generally, your objective is to make the structure have a formal charge of 0. But sometimes the overall structure will have a charge of -1, 1, or really any number. Sometimes it will be clear where the charge should be placed, but other times it can by places on multiple different atoms. This is where resonance structures come in. In the case where the extra electron can be placed in many different places, you will have to draw out each of those structures and label them as resonance structures.
You want the lewis structure to have the least amount of formal charges, or as close to 0. You don't want many atoms in the molecule to have a charge and want them to be as close to 0. So after considering this, you can deduce the shape that is created from the most favorable lewis structure.
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