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We should calculate the formal charge on any compound that has a resonance structure. Through this we are able to determine which of the multiple structures will be the most stable and therefore the most favorable for us. The structure that has the least amount of charged atoms and the lesser strength of charge will be the better one. Hope this helps!
Last edited by Mashkinadze_1D on Mon Oct 28, 2019 9:24 pm, edited 1 time in total.
The safest bet is to do formal charge calculations for all your structures. However, this is more necessary for those atoms as they have a d-orbital, and are thus able to hold more than eight electrons versus the atoms without the d orbital who adhere to the octet rule. Any atom above period 3 has a d orbital and thus acts in the same manner as P,Cl, and S in that they can have more than eight electrons however for this class I believe we only have to be concerned with those three.
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