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That being said, some structures are more stable than others, even though the substance is the same. This is where the calculation of formal charges comes into play. Substances that have more atoms with a formal charge of 0 will be more stable.
Adding on to the replies above, make sure to always calculate the formal charge of each atom to make sure that you have arranged the best possible structure. Not all molecules with double or triple bonds will have resonant structures, so it is important to make sure.
In the lecture, Dr. Lavelle also mentioned that resonance is the blend or average of structures. It is simpler to write different versions of the Lewis structure but as mentioned by other people it is important to check the formal charge and make sure that it is as close to 0 to find the best fitting structure.
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