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Hi! How do you know when you're just supposed to draw one lewis structure vs. when you're supposed to draw every lewis structure to show resonance? Do you just always draw all possible structures or if it just says draw lewis you draw only one but if it says show resonance you draw all?
It should ask for resonance structures in the question if that is what they are looking for. If it just asks to draw THE lewis structure, like in question 101a in chapter 3, there is only one correct structure.
If the question requires you to draw the resonance, it will probably always ask you specifically to. Otherwise, the question would state: "draw the most STABLE lewis structure". Which simply means the one with the lowest formal charge.
You will more than likely be asked specifically to draw a resonance structure, you won't typically know to do it on your own without instruction. However, when drawing lewis structures even if there is resonance you should simply draw the one with the lowest formal charges if the question doesn't include anything explicitly about resonance.
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