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We ban all bots. If you do that for nitrate Do they all look equivalent in what you draw? If not, you may want resonance to make them equivalent. There is a trick aspect here. One can often draw things that are verrrrry unlikely to exist. Perhaps you have been told to draw only reasonable resonance structures or isomers. I wouldn't call them isomers but there are definitely resonance contributors for both of these molecules.
For SCN-, how would you draw its lewis structure? Is there another way you can arrange the bonds? For NO3-, are all the Os equivalent? Experiments say that the actual C-O bond lengths are the same, how does that fit in?
Resonance is one of those things that I never really understood until organic chemistry. Gen Chem 1 gave a brief introduction, and gen Chem 2 had a few more things to add, but it was never really useful. Then orgo comes along and now it's one of the most important concepts and you realize how simple it is! The important thing to realize about resonance forms is that they are not necessarily different structures, but they all together defime what a molecule truly looks like!
When a compound has a formal charge at a certain location, we indicate that with a plus or minus symbol at that atom. If the compound had resonance forms then this is not really an accurate image. Instead, that charge is said to be stabilized by resonance!
Meaning that electron density is truly spread out among the different resonance structures! If this is going over your head, don't panic!! There are many groups on Facebook and forums that can help you find these people.
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