Cl as an expanded octet

Moderators: Chem_Mod, Chem_Admin

Hannah Lee 2F
Posts: 117
Joined: Thu Jul 11, 2019 12:15 am

Cl as an expanded octet

Postby Hannah Lee 2F » Sat Nov 02, 2019 5:49 pm

How can Cl form an expanded octet? And can someone please provide an example of a compound in which Cl acts as an expanded octet?

AngieGarcia_4F
Posts: 120
Joined: Thu Jul 25, 2019 12:17 am

Re: Cl as an expanded octet

Postby AngieGarcia_4F » Sat Nov 02, 2019 5:53 pm

Since Cl is in the third period it can hold electrons in its d shell (3d) and form an expanded octet. I googled it and found the example: ClF3

MKearney_4G
Posts: 50
Joined: Fri Aug 30, 2019 12:18 am

Re: Cl as an expanded octet

Postby MKearney_4G » Sat Nov 02, 2019 10:57 pm

AngieGarcia_4F wrote:I googled it and found the example: ClF3


To add to this, one of the problems on our practice exam was to draw ClO4-, and the only correct way to do it is to know that Cl can access the 3d subshell and accept more electrons. Always check the formal charge to make sure your molecule works out ;)

Tyler Angtuaco 1G
Posts: 130
Joined: Wed Sep 11, 2019 12:16 am

Re: Cl as an expanded octet

Postby Tyler Angtuaco 1G » Sat Nov 02, 2019 11:25 pm

Like other elements in Period 3 or higher, atoms can have an expanded octet because a d-subshell is present, although it isn't filled for Period 3. You can think of it as existing, but empty for Period 3 elements. Thus, when Period 3 elements like Cl gain more electrons, their d-orbitals are occupied.


Return to “Octet Exceptions”

Who is online

Users browsing this forum: No registered users and 0 guests