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the Octet rule

Posted: Sun Oct 28, 2018 4:24 pm
by Peter Nguyen 2I
When forming bonds, do atoms always try to follow the octet rule? Are there exceptions to this rule/guideline?

Re: the Octet rule

Posted: Sun Oct 28, 2018 4:28 pm
by timothy_ho_4B
As far as I know, most atoms should follow the octet rule. There are a few atoms (mostly unstable ones) that bond in
very odd formations, but I'm sure we will go over them in class or they won't be important for the course.

Re: the Octet rule

Posted: Sun Oct 28, 2018 4:30 pm
by RandallNeeDis3K
Yes they always look for the full octet.

Re: the Octet rule

Posted: Sun Oct 28, 2018 4:36 pm
by Rhea Churi 4K
Usually, most atoms try to follow the octet rule. However, there are cases where 1) molecules have an odd number of electrons
(ex. NO), 2) two few valence electrons result in an incomplete octet usually common w boron, aluminum, and beryllium (ex. BH3), or 3) expanded octets - molecules possess more than eight valence electrons (ex. SF6).

Re: the Octet rule

Posted: Sun Oct 28, 2018 4:55 pm
by Daniel Lai
Most elements try to go for a full octet or a half-filled octet.

Re: the Octet rule

Posted: Sun Oct 28, 2018 5:31 pm
by Jessica Castro 2H
Most elements try to follow the Octet Rule in order to obtain a more stable state. However, as Dr. Lavelle mentioned during lecture, Hydrogen, Helium, Lithium, and Beryllium are exceptions to the Octet Rule because they don't have enough electrons in which obtaining 8 valence electrons would make them more stable (instead, they jump down to 2 valence electrons).

Re: the Octet rule

Posted: Sun Oct 28, 2018 5:34 pm
by alanaarchbold
Wait what does hydrogen do in that situation?? Can you explain that better please

Re: the Octet rule

Posted: Sun Oct 28, 2018 5:36 pm
by Esha Harwalkar 3F
Hydrogen only holds 1 electron in the outermost shell (only 1 valence electron), so if drawing a lewis dot structure, it will only have a single bond to another atom and no more dots around it.

Re: the Octet rule

Posted: Sun Oct 28, 2018 5:52 pm
by shaunajava2e
all elements follow the octet rule except hydrogen, helium, lithium, and beryllium which have a max of 2 valance electrons

Re: the Octet rule

Posted: Sun Oct 28, 2018 6:23 pm
by Srikar_Ramshetty 1K
Most atoms do abide by the octet rule, however, there are exceptions. Hydrogen and Helium are examples of atoms that do not since they do not require are fine with having only 2 electrons. There are also examples of atoms having more than 8 electrons, such as sulfur in SF6, this is known as an expanded octet and is not a common feature in a molecule.

Hope this helps!

Re: the Octet rule

Posted: Sun Oct 28, 2018 7:44 pm
by Pritish Patil 1K
Elements usually abide by the octet rule or want a half octet.

Re: the Octet rule

Posted: Sun Oct 28, 2018 8:31 pm
by 405021651
A half octet also makes a stable atom?

Re: the Octet rule

Posted: Sun Oct 28, 2018 9:12 pm
by Yiting_Gong_4L
I think that the octet or the half octet is the most stable.

Re: the Octet rule

Posted: Sun Oct 28, 2018 9:16 pm
by Nick Bazett 1F
Hydrogen becomes a cation when it loses its electron to become stable.

Re: the Octet rule

Posted: Sun Oct 28, 2018 9:27 pm
by Alan Chang
Most follow the octet rule, but there are exceptions. For example there are the ones Dr. Lavelle mentioned in the lecture, and the expanded octet (I don't know if we will learn about this though).

Re: the Octet rule

Posted: Sun Oct 28, 2018 9:53 pm
by Isabelle_Maletz_3E
The octet rule, which states in covalent bonds the atoms share electrons until a noble gas configuration is reached, is applied to most atoms when drawing a Lewis dot structure. However H, He, Li, and Be are all exceptions in that they do not have to form an octet because they do not have enough valence electrons to do so.

Re: the Octet rule

Posted: Sun Oct 28, 2018 10:00 pm
by Rebecca Park
Most of them follow the rules, but I know that Boron is an exception to it even though it only has 6 valence electrons.

Re: the Octet rule

Posted: Sun Oct 28, 2018 10:11 pm
by Avery Zuelch 1D
Yes they always follow the octet rule! Except for hydrogen. That only gets two electrons

Re: the Octet rule

Posted: Sun Oct 28, 2018 10:19 pm
by Luis_Yepez_1F
The only exception to the octet rule are the first four elements, as they will try to only finish the first shell which only needs two e-.

Re: the Octet rule

Posted: Sun Oct 28, 2018 11:23 pm
by Danny Elias Dis 1E
No, there are exceptions. For example, a hydrogen atom has only 1 electron, therefore the maximum number of electrons it can have is two (to fill the orbital).

Re: the Octet rule

Posted: Sun Oct 28, 2018 11:26 pm
by davidryan3f
yes, there are a few exceptions. These exceptions are hydrogen, helium, lithium, beryllium. These atoms don't need to fulfill the octet rule.

Re: the Octet rule

Posted: Sun Oct 28, 2018 11:43 pm
by Arshia Ramesh 1G
Are H, He, Li, Be the only four that are exceptions?