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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,
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you're not changing where the electrons are,
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you're just changing the lines you draw.
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Is that clear?
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It's our notation that's at fault.
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"(2) Structures in which all first-row atoms"