Expanded Octet

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Trent Yamamoto 2J
Posts: 92
Joined: Sat Aug 17, 2019 12:18 am

Expanded Octet

Postby Trent Yamamoto 2J » Sun Nov 03, 2019 11:30 pm

Lewis structures with expanded octets have lower energy than with the regular octet structure (comparing the formal charge), so is it more stable and therefore more favorable to draw structures with expanded octets?

Sidharth D 1E
Posts: 79
Joined: Sat Aug 24, 2019 12:17 am

Re: Expanded Octet

Postby Sidharth D 1E » Sun Nov 03, 2019 11:32 pm

Yes, it is more stable, because the formal charges for the molecule for the expanded octet result in the more dominant resonance structure.

Rohit Ghosh 4F
Posts: 60
Joined: Thu Jul 25, 2019 12:17 am

Re: Expanded Octet

Postby Rohit Ghosh 4F » Thu Nov 07, 2019 4:18 pm

It is important to note that expanded octets only form for elements in period 3 and beyond.

Anthony Hatashita 4H
Posts: 82
Joined: Wed Sep 18, 2019 12:21 am

Re: Expanded Octet

Postby Anthony Hatashita 4H » Thu Nov 07, 2019 5:19 pm

Yes, this is testable with calculating the formal charges of the atoms

Posts: 49
Joined: Thu Jul 25, 2019 12:16 am

Re: Expanded Octet

Postby Megan_1F » Fri Nov 08, 2019 5:08 pm

Yes, expanded octets start from the 3rd row because the 3rd energy level can have the d block sub shell.

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