Did I summarize the octet rule exception correctly?

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Prasanna Padmanabham 4I
Posts: 111
Joined: Thu Jul 25, 2019 12:17 am

Did I summarize the octet rule exception correctly?

Postby Prasanna Padmanabham 4I » Tue Nov 05, 2019 7:22 pm

So basically, when drawing Lewis Structures, the first goal should be to get the smallest formal charge for all the atoms. Does this mean that I should give double bonds to structures even if it means breaking the octet rule if it means that all the atoms in the molecule will have a formal charge of 0 (of course I would break the octet rule for atoms in the 3rd row or below)?

Thank you!

Baoying Li 1B
Posts: 113
Joined: Sat Aug 17, 2019 12:18 am

Re: Did I summarize the octet rule exception correctly?

Postby Baoying Li 1B » Tue Nov 05, 2019 7:30 pm

Yes, I think your summary is pretty good. Just be aware that the formal charge is not always equal to zero, but the more close to zero, the more stable the structure is. Elements like P, As, Cl, As and etc. usually break the octet rule because of their odd valence electrons. Lastly, make sure the total number of valence electron of the Lewis structure is correct. Good luck with the Midterm!


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