Valence Question

[Mycuspidissharp]

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I just started going through the ACS book for Gen Chem and one of the questions says that NO2 violates the octect rule. Is that right? How? I have drawn the structure out and I just don't see it. I understand that something like XeF4 violates the octet rule, however I am befuddled on how NO2 does (If that is correct). I was under the impression from my memory of chads video's that row 4p and below on the periodic table was basically the magic line for what molecules were capable of violating the octect rule, am I mistaken?

 

[casper22]

U remember correctly from the CHAD's videos...

However, when you draw the lewis structure of NO2, there are 17 valence electrons, and from the fact that for a stable resonance structure, the negative charge has to be shared by the more electronegative element, in this case by Oxygen... thus one of the oxygen will form a single bond with N and will have the negative charge..

I hope this helps.