Exceptions to Octet Rule

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aphung1E
Posts: 101
Joined: Sat Aug 24, 2019 12:15 am

Exceptions to Octet Rule

Postby aphung1E » Thu Nov 07, 2019 10:00 pm

Is it true that elements located in period 3 specifically elements Al-Ar are an exception to the octet rule? And if so why?

romina_4C
Posts: 100
Joined: Thu Jul 11, 2019 12:17 am

Re: Exceptions to Octet Rule

Postby romina_4C » Thu Nov 07, 2019 11:13 pm

Yes, elements in period 3 and on are exceptions to the octet rule (can have an expanded octet) because they have a d-orbital that is not filled and that can accept electrons (this is because the d orbital starts existing/being found when n=3, as in you can have a 3d orbital but not a 2d or 1d orbital).

AniP_2D
Posts: 95
Joined: Sat Aug 17, 2019 12:17 am

Re: Exceptions to Octet Rule

Postby AniP_2D » Fri Nov 08, 2019 11:26 am

Yes, elements Phosphorus and onward can hold more than 8 electrons in their shell and thus can exceed the octet rule.

Madeline Phan 1E
Posts: 103
Joined: Sat Aug 17, 2019 12:18 am

Re: Exceptions to Octet Rule

Postby Madeline Phan 1E » Fri Nov 08, 2019 11:40 am

Yes, elements from period 3 and onward have a d shell that can still add on extra electrons.

AronCainBayot2K
Posts: 101
Joined: Fri Aug 30, 2019 12:17 am

Re: Exceptions to Octet Rule

Postby AronCainBayot2K » Fri Nov 08, 2019 11:41 am

Elements in the third period can have more than 8 electrons and are the only exceptions to the octet rule. For example, Cl would be an exception.

Justin Quan 4I
Posts: 104
Joined: Sat Sep 14, 2019 12:17 am

Re: Exceptions to Octet Rule

Postby Justin Quan 4I » Fri Nov 08, 2019 12:19 pm

Due to the fact that elements in the third period elements have a d-orbital shell, they can exceed the octet rule and hold the additional electrons

ThomasNguyen_Dis1H
Posts: 102
Joined: Fri Aug 30, 2019 12:17 am

Re: Exceptions to Octet Rule

Postby ThomasNguyen_Dis1H » Fri Nov 08, 2019 12:22 pm

With an n value of 3, the value of l can be 2 which is the d subshell. Since they have access to d orbitals, they are able to hold extra electrons in this orbital.

Kurtis Liang 3I
Posts: 50
Joined: Sat Aug 24, 2019 12:17 am

Re: Exceptions to Octet Rule

Postby Kurtis Liang 3I » Fri Nov 08, 2019 12:23 pm

Yes, these elements can exceed the octet rule because their empty d-subshell can take on electrons if needed, thus letting the atom hold more than 8 valence electrons.


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