Super Octet  [ENDORSED]

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Rebecca Doan 2L
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Joined: Thu Jul 27, 2017 3:01 am

Super Octet

Postby Rebecca Doan 2L » Sun Oct 29, 2017 11:42 pm

I am confused on the concept of a super octet. I thought there could only be up to 8 electrons in the outer shell. So, how is a super octet formed?

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Re: Super Octet

Postby Chem_Mod » Mon Oct 30, 2017 11:22 am

A super or expanded octet occurs in special elements where their valence shells can hold more than 8 electrons. The 2 prominent elements that can do this are P and S. This is because their formal charge is closer to 0 than if they have an octet, which lowers energy and thus tends to form an expanded rather than normal octet.

Andrea ORiordan 1L
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Re: Super Octet  [ENDORSED]

Postby Andrea ORiordan 1L » Mon Oct 30, 2017 12:40 pm

This happens in periods 3 or higher, especially with p-block elements. This is because they have available d-orbitals that aren't filled with electrons that can be used in bonding. It results in a formal charge closer to 0, which makes the structure lower energy and more stable.

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