List of Octet exceptions

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Alvaro Chumpitaz 4D
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Joined: Wed Sep 11, 2019 12:17 am

List of Octet exceptions

Postby Alvaro Chumpitaz 4D » Tue Oct 29, 2019 7:18 pm

Is there a definitive number of elements that will disobey the octet rule?

Kavya Immadisetty 2B
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Re: List of Octet exceptions

Postby Kavya Immadisetty 2B » Wed Oct 30, 2019 3:11 am

I know for sure that H, Li, Be, and B generally form a duplet instead of an octet. Also, once the elements pass the 3p block, it can have an expanded valence electron shell and form more than an octet.

AlyshaP_2B
Posts: 112
Joined: Wed Sep 18, 2019 12:19 am

Re: List of Octet exceptions

Postby AlyshaP_2B » Wed Oct 30, 2019 8:49 am

Usually, non-metals with a d-subshell can have expanded octets because there are more spaces for electrons to fill

Veronica_Lubera_2A
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Re: List of Octet exceptions

Postby Veronica_Lubera_2A » Wed Oct 30, 2019 9:30 am

Essentially elements can disobey the octet rule in two ways:

1. They can break it by their massive size and extra space of a d-block.
(3 row periodic table and below)

2. They don't reach their 'full potential' of the octet rule because of a high ionization energy. (Ex: BF3; Boron will only have 6 valence electrons because of Flourine's high ionization energy).

Natalie Benitez 1E
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Joined: Fri Aug 02, 2019 12:15 am

Re: List of Octet exceptions

Postby Natalie Benitez 1E » Wed Oct 30, 2019 11:10 am

Is there a limit on the number of electrons the exceptions to the octet rule can have?

Kellylin_4D
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Joined: Sat Aug 24, 2019 12:17 am

Re: List of Octet exceptions

Postby Kellylin_4D » Wed Oct 30, 2019 1:13 pm

Here are some that I got from my plf session

sulfur can have 12 valence e
Nitrogen actually prefers 5
Boron can have 6 valence e

and the ones included by our peers
hopes this helps!

805097738
Posts: 180
Joined: Wed Sep 18, 2019 12:20 am

Re: List of Octet exceptions

Postby 805097738 » Thu Oct 31, 2019 7:16 am

Natalie Benitez 1C wrote:Is there a limit on the number of electrons the exceptions to the octet rule can have?


I believe they tend to hold 10-12 electrons.


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