Exceptions to the Octet Rule Question

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Bita Ghanei 1F
Posts: 60
Joined: Thu Feb 28, 2019 12:15 am

Exceptions to the Octet Rule Question

Postby Bita Ghanei 1F » Tue Oct 29, 2019 4:01 pm

Do P, S, and Cl ALWAYS have to defy the octet rule? Is it only if they are the center atom in the lewis dot structure?

Thanks in advance!

AVerma_F19
Posts: 59
Joined: Thu Jul 25, 2019 12:15 am
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Re: Exceptions to the Octet Rule Question

Postby AVerma_F19 » Tue Oct 29, 2019 4:13 pm

I believe that they generally do. To have an FC of 0, they need an expanded octet.

SMIYAZAKI_1B
Posts: 63
Joined: Sat Aug 24, 2019 12:15 am

Re: Exceptions to the Octet Rule Question

Postby SMIYAZAKI_1B » Fri Nov 01, 2019 2:29 am

In general senses, those elements will be an exception to the octet rules. Of course it does not mean that they HAVE to always, but in most of the cases, it is much more stabilized if they defy the octet rule due to formal charges being close to 0. If you recall like HClO4, you know that formal charge will be less if three of the oxygens have the double bonds in comparison to single bonds.

andrewcj 2C
Posts: 102
Joined: Thu Jul 11, 2019 12:17 am

Re: Exceptions to the Octet Rule Question

Postby andrewcj 2C » Fri Nov 01, 2019 2:54 am

They do not always violate the octet rule. A simple counterexample would be HCl, which follows the rule.


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