Octet Rule

Moderators: Chem_Mod, Chem_Admin

Samantha Burmester 3H
Posts: 43
Joined: Fri Sep 28, 2018 12:23 am

Octet Rule

Postby Samantha Burmester 3H » Sun Oct 28, 2018 11:29 pm

In the lecture, Dr. Lavelle says that the Octet Rule is more of a guideline; is this because there are exceptions?

josephperez_2C
Posts: 70
Joined: Wed Nov 15, 2017 3:04 am

Re: Octet Rule

Postby josephperez_2C » Sun Oct 28, 2018 11:31 pm

The octet rule applies to most atoms, but there are exceptions like hydrogen.

405098546
Posts: 32
Joined: Fri Sep 28, 2018 12:24 am

Re: Octet Rule

Postby 405098546 » Sun Oct 28, 2018 11:37 pm

Yes there are a few exceptions to the octet rule. For example, molecules like NO have an odd number of electrons and in molecules like BCl3 not all the atoms possess 8 electrons.

Angela Cong 3C
Posts: 69
Joined: Fri Sep 28, 2018 12:25 am

Re: Octet Rule

Postby Angela Cong 3C » Sun Oct 28, 2018 11:39 pm

The exceptions are H, He, Li, and Be since they will always be the elements giving their electrons instead of receiving them

Saachi_Kotia_4E
Posts: 68
Joined: Fri Sep 28, 2018 12:23 am

Re: Octet Rule

Postby Saachi_Kotia_4E » Tue Oct 30, 2018 10:57 am

The exceptions are the first few atoms because they usually lose electrons to fill just the 1s orbital. I think other exceptions are like the example from class with SO4, where sulfur had more than 8 electrons because they went into the 3d orbital of sulfur.

Nina Do 4L
Posts: 61
Joined: Fri Sep 28, 2018 12:27 am

Re: Octet Rule

Postby Nina Do 4L » Tue Oct 30, 2018 8:13 pm

The first 4 elements are the ones that are an exception (along with others). The elements H, He, Li, and Be are exceptions to the octet rule because they are in the 2s orbital, meaning they can only have most 2 electrons. Here's more info on them in case you are confused: viewtopic.php?t=6008

Saleha_Mian_3E
Posts: 32
Joined: Fri Sep 28, 2018 12:25 am

Re: Octet Rule

Postby Saleha_Mian_3E » Wed Oct 31, 2018 2:58 pm

I agree what everyone said, but basically the rule says in covalent bonds atoms share electrons until a noble-gas configuration is reached so it helps to check certain Lewis Structures to see the correct structures, there are exceptions like H,He,Li,Be.

JT Wechsler 2B
Posts: 62
Joined: Fri Sep 28, 2018 12:16 am

Re: Octet Rule

Postby JT Wechsler 2B » Wed Oct 31, 2018 3:15 pm

The octet rule is more of a guideline because there are exceptions to the rule like the first 4 electrons and the expanded octet if elements are in the third period or higher.


Return to “Ionic & Covalent Bonds”

Who is online

Users browsing this forum: No registered users and 2 guests