AP Chem

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A valid Lewis structure of __________ cannot be drawn without violating the octet rule.
Answer: BeH2
Why would BeH2 break the octet?

  • AP Chem -

    Is it because it only has four electrons to begin with with only two valence electrons? There's no way it can possible even make an octet?

  • AP Chem -

    Yes but BeH2 is not that common. I think BeCl2 is a better example. Boron is another that breaks the octet rule; e.g., BF3.

  • AP Chem -

    Be and B are the huge ones on breaking the octet rule. But, for that question they gave BeH2 so, I guess reasoning is that they are the exceptions? It's multiple choice. but I still want to understand it.

  • AP Chem -


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