Expanded Octet

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Expanded Octet

Postby torialmquist1F » Sun Nov 12, 2017 9:14 pm

How do we know when it is best to give an element an expanded octet?

Lourick Bustamante 1B
Posts: 50
Joined: Wed Nov 16, 2016 3:02 am

Re: Expanded Octet

Postby Lourick Bustamante 1B » Sun Nov 12, 2017 9:21 pm

All elements in period 3 and further have the ability to have more than 8 valence electrons.

Aliza Ajmal 1D
Posts: 25
Joined: Fri Sep 29, 2017 7:05 am

Re: Expanded Octet

Postby Aliza Ajmal 1D » Sun Nov 12, 2017 9:25 pm

An expanded octet is due to the existence of a "d orbital" which allows for more than 8 electrons.

Kathleen Vidanes 1E
Posts: 62
Joined: Fri Sep 29, 2017 7:07 am

Re: Expanded Octet

Postby Kathleen Vidanes 1E » Sun Nov 12, 2017 9:31 pm

Phosphorus (P), Sulfur (S), and Chlorine (Cl) all have expanded octets. All of the elements following those three can have an expanded octet, as well.

Eli Aminpour 2K
Posts: 50
Joined: Fri Sep 29, 2017 7:04 am

Re: Expanded Octet

Postby Eli Aminpour 2K » Sun Nov 12, 2017 11:16 pm

First you need to check if the element can have an expanded octet. It should be in period three or higher (P, S, Cl, etc). If expanding the octet allows all the formal charges to become zero/ it forms a more stable molecule, than do it. Sometimes its obvious to do if there are 6 peripheral atoms and only one central atom (XeF6), other times its less obvious. Always check formal charges

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