Breaking the Octet Rule

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Rogelio Bazan 1D
Posts: 64
Joined: Tue Nov 14, 2017 3:01 am

Breaking the Octet Rule

Postby Rogelio Bazan 1D » Wed Jun 13, 2018 9:43 pm

I know that in some cases for Lewis Structures there are exceptions to the octet rule and some elements take more electrons than fit in an octet, I found a problem online which just for review I want to go over. Can someone tell me what the Lewis Structure for PCl3O is?

Andrew Evans - 1G
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Joined: Fri Apr 06, 2018 11:02 am
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Re: Breaking the Octet Rule

Postby Andrew Evans - 1G » Wed Jun 13, 2018 10:01 pm

When I draw lewis structures I try to satisfy formal charges before considering octet rule honestly, so since P has 5 valence electrons, give it 3 bonds with each of the Cl and a double bond with the Oxygen. All atoms have a formal charge of 0. Now you can see that P would then have a total of 10 surrounding electrons instead of the octet's 8, but this is okay since it is in that third row of elements and can now break the octet rule and enter d orbitals.

victoriatanaka1C
Posts: 38
Joined: Fri Apr 06, 2018 11:05 am

Re: Breaking the Octet Rule

Postby victoriatanaka1C » Wed Jun 13, 2018 10:36 pm

And just to clarify, the elements that can break the octet rule are H, He, Li, Be, Column 13 and Row 3 and below?

Andrea Raymundo 1B
Posts: 32
Joined: Wed Nov 15, 2017 3:04 am

Re: Breaking the Octet Rule

Postby Andrea Raymundo 1B » Thu Jun 14, 2018 12:56 am

victoriatanaka1C wrote:And just to clarify, the elements that can break the octet rule are H, He, Li, Be, Column 13 and Row 3 and below?

yes, group 13 can have less than 8 valence elctrons and period 3 and under can have more than 8 valence electrons


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