Valence-bond formula

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What is the "Valence-bond formula" of a molecule? I saw it as a potential answer in the AAMC Self Assessment - Chemistry test, question 85. I've tried looking it up and I can't figure out exactly what that means. Is it just meant to be a distraction? The question was referring to two molecules that had the same empirical formula.

 

[eradicator]

What is the "Valence-bond formula" of a molecule? I saw it as a potential answer in the AAMC Self Assessment - Chemistry test, question 85. I've tried looking it up and I can't figure out exactly what that means. Is it just meant to be a distraction? The question was referring to two molecules that had the same empirical formula.

Can you state the question/context here?