Octet Rule

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Mariah
Posts: 104
Joined: Fri Aug 02, 2019 12:16 am

Octet Rule

Postby Mariah » Tue Oct 29, 2019 1:18 pm

How do we know which elements have expanded octets? Do these need to be memorized?

ALegala_2I
Posts: 102
Joined: Thu Jul 11, 2019 12:17 am

Re: Octet Rule

Postby ALegala_2I » Tue Oct 29, 2019 2:03 pm

Professor Lavelle said that phosphorus, sulfur, and chlorine can have expanded octets. This is due to the fact that they have empty p orbitals which can accommodate additional electrons.

904914037
Posts: 65
Joined: Wed Sep 18, 2019 12:16 am

Re: Octet Rule

Postby 904914037 » Tue Oct 29, 2019 10:49 pm

A UA also said that elements row three and beyond can have expanded octets because they have empty spots in the d shell to fill.

Omar Selim 1D
Posts: 108
Joined: Sat Jul 20, 2019 12:16 am

Re: Octet Rule

Postby Omar Selim 1D » Tue Oct 29, 2019 11:57 pm

Elements in row 3 and beyond is usually the rule of thumb because they have empty orbitals

Abigail Sanders 1E
Posts: 112
Joined: Wed Sep 11, 2019 12:16 am

Re: Octet Rule

Postby Abigail Sanders 1E » Wed Oct 30, 2019 12:22 am

Like the previous replies have said, expanded octets can occur in elements of row 3 and beyond. When checking for resonance and finding the lowest energy structure, make sure to calculate formal charge along with the bonding as ti will help you reach the final stage where resonance can be examined.

Grecia Velasco 4D
Posts: 56
Joined: Thu Jul 11, 2019 12:17 am

Re: Octet Rule

Postby Grecia Velasco 4D » Wed Oct 30, 2019 4:55 pm

Mariah wrote:How do we know which elements have expanded octets? Do these need to be memorized?


Lavelle said that elements in row three have expanded octets.

Verity Lai 2K
Posts: 100
Joined: Sat Aug 24, 2019 12:18 am

Re: Octet Rule

Postby Verity Lai 2K » Wed Oct 30, 2019 5:24 pm

All elements past row three because they have the extra d-orbital space. P, Cl and S were the beginning of this exception and I think these are the most important ones to remember. And then boron and aluminum can be stable without a full octet.

Brittany Tran 3I
Posts: 50
Joined: Sat Jul 20, 2019 12:16 am

Re: Octet Rule

Postby Brittany Tran 3I » Wed Oct 30, 2019 9:32 pm

elements in the 3rd period on have expanded octets but P, S, and Cl are the most important ones to remember

Anokhi Patel 2B
Posts: 76
Joined: Fri Aug 09, 2019 12:17 am

Re: Octet Rule

Postby Anokhi Patel 2B » Thu Oct 31, 2019 5:45 pm

Elements in the third period, S, P, and Cl are exceptions to the octet rules. For example, Sulfur is capable of making 6 bonds. This was shown in the example of SF6.


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