expanded octet?

Moderators: Chem_Mod, Chem_Admin

Giovanni Anguiano-Gutierrez 3L
Posts: 52
Joined: Thu Jul 25, 2019 12:17 am

expanded octet?

Postby Giovanni Anguiano-Gutierrez 3L » Mon Oct 28, 2019 12:43 am

Why do S, Cl, and P have expanded octets?

Jacob Motawakel
Posts: 103
Joined: Wed Sep 18, 2019 12:20 am
Been upvoted: 1 time

Re: expanded octet?

Postby Jacob Motawakel » Mon Oct 28, 2019 1:11 am

Their valence shells have enough orbitals to accommodate extra electrons.

Rishika Yadav 3D
Posts: 53
Joined: Wed Sep 11, 2019 12:17 am

Re: expanded octet?

Postby Rishika Yadav 3D » Mon Oct 28, 2019 1:34 am

Accommodating more electrons often works for the d-orbital. An element with a principle quantum number of 2 cannot be expanded because there is no 2d-orbital.

Jordan Ziegler 2J
Posts: 59
Joined: Sat Aug 17, 2019 12:15 am

Re: expanded octet?

Postby Jordan Ziegler 2J » Mon Oct 28, 2019 2:05 am

Looking at the periodic table, elements with unfilled d-orbitals will be able to sustain expanded octets. Because phosphorus, sulfur, and chlorine are in Period 3, they don't have filled d-orbitals. Thus, they will accept bonding pairs.

Robin Cadd 1D
Posts: 113
Joined: Thu Jul 11, 2019 12:16 am

Re: expanded octet?

Postby Robin Cadd 1D » Mon Oct 28, 2019 7:59 am

Also, an important conceptual point to add: the possibility of an expanded octet continues for the atoms below Cl, P, and S within the p-block.

Sam McNeill 1E
Posts: 110
Joined: Sat Aug 24, 2019 12:17 am

Re: expanded octet?

Postby Sam McNeill 1E » Mon Oct 28, 2019 11:11 am

All p-block elements Period 3 and down can be expanded because they have the option to move electrons to the d-block.

Kelsey Ash 1D
Posts: 50
Joined: Wed Sep 18, 2019 12:16 am

Re: expanded octet?

Postby Kelsey Ash 1D » Mon Oct 28, 2019 2:26 pm

Elements that haven't filled their d-orbital can have an expanded octet.

Sion Hwang 4D
Posts: 51
Joined: Wed Sep 18, 2019 12:21 am

Re: expanded octet?

Postby Sion Hwang 4D » Mon Oct 28, 2019 5:23 pm

They're in period 3, which means that they have access to the 3d orbital. This orbital can accommodate extra orbitals, so these atoms can have over 8 valence electrons.

Leila_4G
Posts: 114
Joined: Sat Sep 14, 2019 12:17 am

Re: expanded octet?

Postby Leila_4G » Mon Oct 28, 2019 8:38 pm

Were there any other elements perhaps in the same group way down the periodic table that have this exception other than those 3?

Arvind 4G
Posts: 51
Joined: Thu Jul 11, 2019 12:17 am
Been upvoted: 1 time

Re: expanded octet?

Postby Arvind 4G » Mon Oct 28, 2019 10:46 pm

They do not have a filled d orbital and are thus able to have expanded octets.


Return to “Octet Exceptions”

Who is online

Users browsing this forum: No registered users and 1 guest