Expanded Octets and Formal Charge

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Ashley Wang 4G
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Joined: Wed Sep 11, 2019 12:16 am

Expanded Octets and Formal Charge

Postby Ashley Wang 4G » Sun Nov 03, 2019 1:01 am


In lecture it was mentioned that it it preferable for the non-central atoms to carry the nonzero formal charges when necessary. If the central atom has an expanded octet, is it then okay to have a nonzero formal charge on the central atom?

Thank you!

Posts: 108
Joined: Thu Jul 11, 2019 12:15 am

Re: Expanded Octets and Formal Charge

Postby rabiasumar2E » Sun Nov 03, 2019 8:50 am

For the most part, the central atom will only have an expanded octet because we are trying to get the formal charge to zero. The point is just to draw the best lewis structure so if your formal charge for the central atom isn't zero and it has an expanded octet, I would try to move somethings around. Sorry if this is confusing! Hope it helps.

Caroline Zepecki
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Joined: Fri Aug 09, 2019 12:16 am

Re: Expanded Octets and Formal Charge

Postby Caroline Zepecki » Sun Nov 03, 2019 9:49 am

Are there only particular atoms/molecules that allow for expanded octets? Also is there a way to explain why this is possible for some and not all?

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Re: Expanded Octets and Formal Charge

Postby rohun2H » Sun Nov 03, 2019 10:25 am

The expanded octet rule applies for atoms on the periodic table row 3 and beyond because electrons can utilize the d subshell.

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