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Cl as an Expanded Octet

Posted: Sat Nov 04, 2017 11:47 pm
by Andy Liao 1B
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?

Re: Cl as an Expanded Octet

Posted: Sun Nov 05, 2017 12:01 am
by Gurpreet Khamba 1J
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-.

Re: Cl as an Expanded Octet

Posted: Sun Nov 05, 2017 11:49 am
by Tasnia Haider 1E
Since Chlorine is in the n=3 shell, that means it can gain more electrons to put into a 3d shell, if necessary.

Re: Cl as an Expanded Octet

Posted: Sun Nov 05, 2017 4:46 pm
by Yizhou Liu 3L
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.