## Limit to expanded octet

Aedra Li 3H
Posts: 40
Joined: Fri Aug 30, 2019 12:17 am

### Limit to expanded octet

Is there a certain amount of lone pairs or bonds that an expanded octet can have?

Ariel Davydov 1C
Posts: 110
Joined: Thu Jul 11, 2019 12:16 am
Been upvoted: 1 time

### Re: Limit to expanded octet

It would most likely be limited to the number of electrons available in the element's d-orbital. Typically though, you would use the formal charge of the element to determine how many electrons its expanded octet would typically hold at its lowest energy state.

ZevMarx-Kahn3C
Posts: 52
Joined: Sat Aug 17, 2019 12:17 am

### Re: Limit to expanded octet

What if the element also has the f-orbital available to it?

ChristianM3F
Posts: 61
Joined: Sat Sep 14, 2019 12:16 am

### Re: Limit to expanded octet

Also, so if the expanded octet rule would be limited by the space in the d/f orbitals, would that mean:
-elements in the p-block on period 3 can have an expanded octet of up to... ten electrons..?
-elements in the d-block on period 4 can have an expanded octet of up to 10-how many electrons are in the d-block already. For example, Iron can have an expanded octet of four more electrons (since there's room for four more electrons in the d-block...)
Can anyone confirm? Or at least say their thoughts..?

Kevin Liu 1J
Posts: 53
Joined: Thu Jul 25, 2019 12:16 am

### Re: Limit to expanded octet

Expanded octet often is restrained to those with odd number of valence electrons

AnayaArnold_3L
Posts: 56
Joined: Wed Sep 18, 2019 12:19 am

### Re: Limit to expanded octet

it usually involves the number of valence electrons available in either the d or p block.

san_2F
Posts: 118
Joined: Sat Jul 20, 2019 12:15 am

### Re: Limit to expanded octet

The limit would have to do with number of electrons an entire molecule can have and the formal charges.

Posts: 58
Joined: Thu Jul 25, 2019 12:15 am

### Re: Limit to expanded octet

Aedra Li 3H wrote:Is there a certain amount of lone pairs or bonds that an expanded octet can have?

The amount of lone pairs or bonds are limited to the amount of un-bonded pairs available in the atom. The number of electrons available in the expanded octet are restricted to the capacity of the d and f orbital.