Sulfur bonding

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William Chan 1D
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Joined: Sat Sep 14, 2019 12:15 am

Sulfur bonding

Postby William Chan 1D » Fri Oct 25, 2019 10:35 am

In lecture today, Lavelle showed that sulfur can have 6 bonds (2 double bonds, 2 single bonds). Wouldn’t that be more than a full shell (of 8 e-)? Why is this allowed?

Posts: 107
Joined: Sat Aug 24, 2019 12:17 am

Re: Sulfur bonding

Postby Goyama_2A » Fri Oct 25, 2019 10:57 am

Although most elements need exactly 8 electrons in a bond to be stable, there are some exceptions to the rule. Some elements, like Boron, can be stable with less than 8 electrons, while some other elements, like Sulfur, can be stable with more than 8 electrons. This is due to the expansion of valence that occurs which allows certain elements, like sulfur, to utilize their empty d-orbitals to hold more electrons. In this case, sulfur is using its empty 3D orbital to allow itself to fit up to 12 electrons rather than only 8.

Jaci Glassick 2G
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Joined: Sat Jul 20, 2019 12:16 am

Re: Sulfur bonding

Postby Jaci Glassick 2G » Fri Oct 25, 2019 11:01 am

I just got out of lecture. Lavelle said that certain atoms can break the octane rule. P, Cl, and S can accommodate more than 8 valence electrons. Atoms in period 3 or higher have higher d-orbitals (I'm literally coping my notes so if this is really brief that is why).

Alexa Mugol 3I
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Joined: Sat Aug 17, 2019 12:17 am

Re: Sulfur bonding

Postby Alexa Mugol 3I » Fri Oct 25, 2019 11:24 am

To add on to the other replies, P, Cl, and S can bond up to 6 times because they can utilize their empty 3d orbitals. 2p elements aren't able to do this because there aren't any 2d orbitals. I'm pretty sure that other elements with empty d orbitals can also bond more than 4 times.

Ruth Glauber 1C
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Joined: Wed Sep 18, 2019 12:20 am

Re: Sulfur bonding

Postby Ruth Glauber 1C » Thu Nov 07, 2019 10:52 pm

I think that this is called an expanded octet.

Areena H 2K
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Joined: Wed Dec 05, 2018 12:18 am

Re: Sulfur bonding

Postby Areena H 2K » Sun Nov 10, 2019 11:56 am

Everything third row and beyond can have expanded octets because they have d shells that are available for them to use, therefore they can all have expanded octets.

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