## Expanded Octet

Trent Yamamoto 2J
Posts: 111
Joined: Sat Aug 17, 2019 12:18 am

### Expanded Octet

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: 98
Joined: Sat Aug 24, 2019 12:17 am

### Re: Expanded Octet

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: 99
Joined: Thu Jul 25, 2019 12:17 am

### Re: Expanded Octet

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

Anthony Hatashita 4H
Posts: 103
Joined: Wed Sep 18, 2019 12:21 am

### Re: Expanded Octet

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

Megan_1F
Posts: 49
Joined: Thu Jul 25, 2019 12:16 am

### Re: Expanded Octet

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