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"(1) Resonance structures involve no change in the positions of nuclei;
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only electron distribution is involved."
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That is, when you draw these two structures
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you don't move the atoms,
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you just change
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where you draw a single bond or a double bond
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or a dotted bond or something like that.
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And in fact
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that's not even true
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the electrons know where they want to be,
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it's the way we draw them that's uncertain.
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So when you draw two different resonance structures,