Moderators: Chem_Mod, Chem_Admin

Talia Leano 2H
Posts: 83
Joined: Wed Sep 30, 2020 10:10 pm


Postby Talia Leano 2H » Mon Nov 09, 2020 1:08 am

Why can sulfate have an extended octate?

David Liu 1E
Posts: 85
Joined: Wed Sep 30, 2020 10:07 pm

Re: Sulfate

Postby David Liu 1E » Mon Nov 09, 2020 1:57 am

sulfate/sulfur can have expanded d- orbitals; I'm not entirely sure why it happens, but because it has something to do with the d-orbitals elements in the second period can't have expanded octets, which is why sulfur is an example

David Chibukhchian 2G
Posts: 153
Joined: Wed Sep 30, 2020 9:50 pm

Re: Sulfate

Postby David Chibukhchian 2G » Mon Nov 09, 2020 9:43 am

Sulfur can have an expanded octet because it has valence electrons in the n=3 shell. This means it can basically utilize the 3d subshell when bonding, allowing it to have more than 8 electrons surrounding it in a Lewis Structure. Keep in mind that this would not work with the elements that don't fill up the n=3 shell. For example, nitrogen has electrons only up until the n=2 shell, which means it can't use the 3d subshell like sulfur can. I hope that answers your question!

Madison Wong 3H
Posts: 95
Joined: Wed Sep 30, 2020 9:35 pm
Been upvoted: 2 times

Re: Sulfate

Postby Madison Wong 3H » Mon Nov 09, 2020 9:47 am

I'm not positive, but basing it on quantum numbers, I think atoms in the d block have quantum number l=2 and thus can have 10 electrons since Ml can be 2,1,0,-1,-2 and 2 electrons can accompany each of those, which would be an expanded octet. I'm still a bit confused myself though.

Inderpal Singh 2L
Posts: 140
Joined: Wed Sep 30, 2020 10:02 pm
Been upvoted: 2 times

Re: Sulfate

Postby Inderpal Singh 2L » Mon Nov 09, 2020 10:13 am

As far as I know, it is because sulfate has d-orbitals. However, I am also still confused on why it is allowed an expanded octet. However, I think it may have something to do with the post being directly above mine ^ (-2,-1,0,1,2)

Cassidy Cheng 1J
Posts: 56
Joined: Wed Sep 30, 2020 9:33 pm

Re: Sulfate

Postby Cassidy Cheng 1J » Mon Nov 09, 2020 6:09 pm

Completely agree with the posts above me! But going off of that, elements in n=1 and n=2 can't have expanded octets bc according to the quantum numbers (i.e. n=2, l= 0, 1) they only have s and p orbitals, and they therefore only have 8 possible valence e-. Elements in n=3, however, have quantum numbers of n=3, l=0, 1, 2, and ml = -2, -1, 0, 1, 2, which means that they have s, p, and d orbitals. These elements therefore have the d orbitals (an extra 10 possible e-) that allows for the expanded octet.

Chudi Onyedika 3A
Posts: 89
Joined: Wed Sep 30, 2020 9:37 pm

Re: Sulfate

Postby Chudi Onyedika 3A » Sun Nov 15, 2020 3:35 pm

Sulfur is in the 3rd energy level, which gives it access to the d-orbital. The d-orbital gives room for more electrons.

Colin Squire 3B
Posts: 85
Joined: Wed Sep 30, 2020 9:35 pm

Re: Sulfate

Postby Colin Squire 3B » Sun Nov 15, 2020 3:47 pm

Sulfur has access to the d-orbitals since it is in the third energy level. Because of this, it can hold more than 8 electrons, breaking the octet rule.

Posts: 86
Joined: Wed Sep 30, 2020 9:34 pm

Re: Sulfate

Postby AlbertGu_2C » Sun Nov 15, 2020 5:26 pm

Any element past the 3rd period of the periodic table is able to have an expanded octet of electrons due to having access to more values of l.

Return to “Ionic & Covalent Bonds”

Who is online

Users browsing this forum: No registered users and 1 guest