learning octet excptions

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Emily Kennedy 4L
Posts: 57
Joined: Fri Sep 28, 2018 12:25 am
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learning octet excptions

Postby Emily Kennedy 4L » Sun Nov 11, 2018 8:40 pm

are there any tricks to learning the octet exceptions and knowing how many bonds each element usually wants?

Krisdylle Repollo 4H
Posts: 33
Joined: Fri Sep 28, 2018 12:28 am

Re: learning octet excptions

Postby Krisdylle Repollo 4H » Sun Nov 11, 2018 8:50 pm

Octet exceptions are usually for atoms who have access to their d subshell. I would suggest looking to see if the central atom in your molecule can access it and if it does then that atom can have 10 electrons instead of fulfilling the octet.

804994652
Posts: 68
Joined: Fri Sep 28, 2018 12:26 am

Re: learning octet excptions

Postby 804994652 » Sun Nov 11, 2018 9:29 pm

I would say the elements where the octet rule is strictly enforced is rows 1 & 2 (other than H/He) since rows 3 on have access to d orbital like the above response mentioned.

Luc Lorain 1L
Posts: 59
Joined: Fri Sep 28, 2018 12:18 am

Re: learning octet excptions

Postby Luc Lorain 1L » Sun Nov 11, 2018 10:04 pm

An additional subgroup of octet exceptions are the Lewis acids of periods 2 and 3-- Boron and Aluminum. These two elements are alright having a partially-filled octet of 6 valence e-, but may also possess a filled octet. I think you may just need to remember that those two are exceptions; perhaps remember that the first two elements of the IIIA column are exceptions?

Sheridan Slaterbeck 1J
Posts: 62
Joined: Fri Sep 28, 2018 12:27 am

Re: learning octet excptions

Postby Sheridan Slaterbeck 1J » Sun Nov 11, 2018 10:14 pm

My TA said you don't have to memorize these just know that it could be possible in periods 3 and on, but not in period 1 or 2.


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