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Octet Rule

Posted: Sun Oct 28, 2018 11:29 pm
by Samantha Burmester 3H
In the lecture, Dr. Lavelle says that the Octet Rule is more of a guideline; is this because there are exceptions?

Re: Octet Rule

Posted: Sun Oct 28, 2018 11:31 pm
by josephperez_2C
The octet rule applies to most atoms, but there are exceptions like hydrogen.

Re: Octet Rule

Posted: Sun Oct 28, 2018 11:37 pm
by 405098546
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.

Re: Octet Rule

Posted: Sun Oct 28, 2018 11:39 pm
by Angela Cong 3C
The exceptions are H, He, Li, and Be since they will always be the elements giving their electrons instead of receiving them

Re: Octet Rule

Posted: Tue Oct 30, 2018 10:57 am
by Saachi_Kotia_4E
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.

Re: Octet Rule

Posted: Tue Oct 30, 2018 8:13 pm
by Nina Do 4L
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

Re: Octet Rule

Posted: Wed Oct 31, 2018 2:58 pm
by Saleha_Mian_3E
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.

Re: Octet Rule

Posted: Wed Oct 31, 2018 3:15 pm
by JT Wechsler 2B
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.