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Octet exception

Posted: Sun Nov 10, 2019 11:06 pm
by 405398682
What elements are exempted from Octet rule (eg. P) and why?

Re: Octet exception

Posted: Sun Nov 10, 2019 11:08 pm
by Jonathan Gong 2H
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.

Re: Octet exception

Posted: Sun Nov 10, 2019 11:09 pm
by Bilal Pandit 1J
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.

Re: Octet exception

Posted: Sun Nov 10, 2019 11:10 pm
by KnarGeghamyan1B
Some typical exceptions are S, P, and Cl.

Re: Octet exception

Posted: Tue Nov 12, 2019 5:41 am
by Michelle Song 1I
Boron and Aluminum are also exceptions in that they can form only 3 bonds.

Re: Octet exception

Posted: Tue Dec 03, 2019 11:11 am
by AnayaArnold_3L
What role do octet exceptions hod when it comes to identifying polarity?

Re: Octet exception

Posted: Fri Dec 06, 2019 12:44 pm
by Kaitlynn Tran 3F
Atoms in row 3 and below on the periodic table can typically have expanded octets.

Re: Octet exception

Posted: Fri Dec 06, 2019 2:17 pm
by Shutong Hou_1F
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.

Re: Octet exception

Posted: Sat Dec 07, 2019 9:32 pm
by Alan Cornejo 1a
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.

Re: Octet exception

Posted: Sun Dec 08, 2019 6:12 pm
by Annie Ye
Elements in 3p or higher have the octet exception because of the d orbital.

Re: Octet exception

Posted: Sun Dec 08, 2019 6:22 pm
by Aman Sankineni 2L
Any element beyond Na would have the exception.

Re: Octet exception

Posted: Sun Dec 08, 2019 6:44 pm
by jisulee1C
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.

Re: Octet exception

Posted: Sun Dec 08, 2019 6:47 pm
by Samuel Tzeng 1B
Elements with the third energy shell and on since the d-orbital can also have electrons

Re: Octet exception

Posted: Sun Dec 08, 2019 7:07 pm
by JasonKwon_3k
elements after the third period are where they will be able to display expanded octet behavior.