Cl as an Expanded Octet

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Andy Liao 1B
Posts: 52
Joined: Thu Jul 13, 2017 3:00 am

Cl as an Expanded Octet

Postby Andy Liao 1B » Sat Nov 04, 2017 11:47 pm

I remember hearing in lecture that Cl can form an expanded octet. However, I was told that this wasn't possible. Can someone explain or give an example of when Cl forms an expanded octet?

Gurpreet Khamba 1J
Posts: 18
Joined: Fri Sep 29, 2017 7:04 am

Re: Cl as an Expanded Octet

Postby Gurpreet Khamba 1J » Sun Nov 05, 2017 12:01 am

Since Cl is in the 3rd period, and at the end, is more likely to gain e-, it is possible for it to take electrons if needed. An example of this is ClF3.
There are 28 e- and F will not take more than 8 leaving Cl with an extra 4 e-.

Tasnia Haider 1E
Posts: 55
Joined: Sat Jul 22, 2017 3:01 am

Re: Cl as an Expanded Octet

Postby Tasnia Haider 1E » Sun Nov 05, 2017 11:49 am

Since Chlorine is in the n=3 shell, that means it can gain more electrons to put into a 3d shell, if necessary.

Yizhou Liu 3L
Posts: 19
Joined: Fri Sep 29, 2017 7:07 am

Re: Cl as an Expanded Octet

Postby Yizhou Liu 3L » Sun Nov 05, 2017 4:46 pm

ClO4^1- is a good example that Cl has expanded valence shell. If you put Cl as the central atom and connect it with O using single bond, you'll see the formal charge of Cl is +3 and O is -1. However, if you consider it as three double bonds and one single bond, the formal charge of Cl will be 0 and it'll be more stable. In this case, Cl has expanded its valence shell to 14 electrons.


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