Octet exception

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405398682
Posts: 26
Joined: Wed Sep 18, 2019 12:21 am

Octet exception

Postby 405398682 » Sun Nov 10, 2019 11:06 pm

What elements are exempted from Octet rule (eg. P) and why?

Jonathan Gong 2H
Posts: 105
Joined: Sat Jul 20, 2019 12:16 am

Re: Octet exception

Postby Jonathan Gong 2H » Sun Nov 10, 2019 11:08 pm

Elements in the 3p or higher orbital are exceptions to the octet rule. This is because they have an empty d-orbital that allows them to hold more than 8 valence e-, e.g. for P, it is located in the 3p orbital, but has an empty 3d orbital that allows it to hold more than 8 e- and be an exception.

Bilal Pandit 1J
Posts: 98
Joined: Wed Sep 11, 2019 12:16 am

Re: Octet exception

Postby Bilal Pandit 1J » Sun Nov 10, 2019 11:09 pm

Elements that have a d-orbital are able to have more than an octet, as the electrons will go into the d-orbital. These are basically all the elements in the 3rd row and down.

KnarGeghamyan1B
Posts: 102
Joined: Fri Aug 09, 2019 12:15 am

Re: Octet exception

Postby KnarGeghamyan1B » Sun Nov 10, 2019 11:10 pm

Some typical exceptions are S, P, and Cl.

Michelle Song 1I
Posts: 102
Joined: Thu Jul 11, 2019 12:17 am

Re: Octet exception

Postby Michelle Song 1I » Tue Nov 12, 2019 5:41 am

Boron and Aluminum are also exceptions in that they can form only 3 bonds.

AnayaArnold_3L
Posts: 56
Joined: Wed Sep 18, 2019 12:19 am

Re: Octet exception

Postby AnayaArnold_3L » Tue Dec 03, 2019 11:11 am

What role do octet exceptions hod when it comes to identifying polarity?

Kaitlynn Tran 3F
Posts: 54
Joined: Wed Sep 18, 2019 12:20 am

Re: Octet exception

Postby Kaitlynn Tran 3F » Fri Dec 06, 2019 12:44 pm

Atoms in row 3 and below on the periodic table can typically have expanded octets.

Shutong Hou_1F
Posts: 117
Joined: Sat Sep 14, 2019 12:17 am

Re: Octet exception

Postby Shutong Hou_1F » Fri Dec 06, 2019 2:17 pm

Michelle Song 3I wrote:Boron and Aluminum are also exceptions in that they can form only 3 bonds.

Exactly. But to be more specific, without any additional lone pairs, the number of valence electrons around boron and aluminum is then only 6, not reaching octet.

Alan Cornejo 1a
Posts: 98
Joined: Fri Aug 30, 2019 12:15 am

Re: Octet exception

Postby Alan Cornejo 1a » Sat Dec 07, 2019 9:32 pm

Jonathan Gong 1A wrote:Elements in the 3p or higher orbital are exceptions to the octet rule. This is because they have an empty d-orbital that allows them to hold more than 8 valence e-, e.g. for P, it is located in the 3p orbital, but has an empty 3d orbital that allows it to hold more than 8 e- and be an exception.


This is correct for atoms that can have more than 8 electrons, but Boron and Aluminum can also break the rule in that they can form compounds with only 6 valence electrons.

Annie Ye
Posts: 106
Joined: Wed Sep 18, 2019 12:22 am

Re: Octet exception

Postby Annie Ye » Sun Dec 08, 2019 6:12 pm

Elements in 3p or higher have the octet exception because of the d orbital.

Aman Sankineni 2L
Posts: 103
Joined: Fri Aug 30, 2019 12:17 am

Re: Octet exception

Postby Aman Sankineni 2L » Sun Dec 08, 2019 6:22 pm

Any element beyond Na would have the exception.

jisulee1C
Posts: 149
Joined: Thu Jul 25, 2019 12:17 am

Re: Octet exception

Postby jisulee1C » Sun Dec 08, 2019 6:44 pm

Any element in the beyond 3s2 will be able to form more than four bonds and is therefore an exception because the d orbital begins in principle energy level 3 and is therefore able to accomodate more than the standard 8 electrons.

Samuel Tzeng 1B
Posts: 103
Joined: Sat Aug 24, 2019 12:15 am

Re: Octet exception

Postby Samuel Tzeng 1B » Sun Dec 08, 2019 6:47 pm

Elements with the third energy shell and on since the d-orbital can also have electrons

JasonKwon_3k
Posts: 51
Joined: Thu Jul 11, 2019 12:16 am

Re: Octet exception

Postby JasonKwon_3k » Sun Dec 08, 2019 7:07 pm

elements after the third period are where they will be able to display expanded octet behavior.


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