Formal Charge vs Octet Rule


Moderators: Chem_Mod, Chem_Admin

305421980
Posts: 101
Joined: Sat Sep 07, 2019 12:16 am

Formal Charge vs Octet Rule

Postby 305421980 » Wed Nov 13, 2019 11:48 am

When drawing Lewis Structures should we be more concerns with the octet rule before formal charge?

Megan Vu 1J
Posts: 101
Joined: Thu Jul 25, 2019 12:15 am

Re: Formal Charge vs Octet Rule

Postby Megan Vu 1J » Wed Nov 13, 2019 12:12 pm

Yes, primarily you should start with the octet rule first in order to check the lewis structure that you drew. Only afterwards should you concern yourself with the formal charge in drawing a stable structure because you have already finished the octet rule.

Sukanya Mohapatra 2G
Posts: 100
Joined: Sat Aug 17, 2019 12:18 am
Been upvoted: 1 time

Re: Formal Charge vs Octet Rule

Postby Sukanya Mohapatra 2G » Sat Nov 16, 2019 4:56 pm

Yes, you should be more concerned with the octet rule first.

Tiffany Chao 2H
Posts: 117
Joined: Fri Aug 09, 2019 12:17 am

Re: Formal Charge vs Octet Rule

Postby Tiffany Chao 2H » Sat Nov 16, 2019 6:15 pm

Just treat drawing Lewis structures for molecules as drawing a normal Lewis structure. Afterwards, go onto VSEPR.

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

Re: Formal Charge vs Octet Rule

Postby Madeline Phan 1E » Sat Nov 16, 2019 6:56 pm

When drawing Lewis structures you should pay attention to number of electrons, and then the octet rule, and then formal charge in order of increasing importance.

Mai V 4L
Posts: 111
Joined: Fri Sep 28, 2018 12:23 am

Re: Formal Charge vs Octet Rule

Postby Mai V 4L » Sun Dec 08, 2019 9:14 am

Does anyone have a viideo they think is a good reference for this topic?

Carly_Lipschitz_3H
Posts: 67
Joined: Wed Sep 30, 2020 9:56 pm

Re: Formal Charge vs Octet Rule

Postby Carly_Lipschitz_3H » Thu Nov 12, 2020 11:57 am

Yes! Octet rule should always be the first thing you do in creating the Lewis Dot Structure. Only after you have done this step then you calculate the formal charges after and can alter the structure if you need to in order to make the structure as stable as possible.

Maya Johnson 2a
Posts: 71
Joined: Wed Sep 30, 2020 9:47 pm

Re: Formal Charge vs Octet Rule

Postby Maya Johnson 2a » Thu Nov 12, 2020 12:41 pm

Yes, use the octet rule to draw your lewis diagrams, then assign formal charges to the atoms.

derickngo3d
Posts: 67
Joined: Wed Sep 30, 2020 9:51 pm

Re: Formal Charge vs Octet Rule

Postby derickngo3d » Thu Nov 12, 2020 2:46 pm

Octet rule comes first.

Madisen Brown -1C
Posts: 54
Joined: Wed Sep 30, 2020 9:49 pm

Re: Formal Charge vs Octet Rule

Postby Madisen Brown -1C » Thu Nov 12, 2020 8:34 pm

I agree with the other responses! The octet rule should be the primary concern before a formal charge.

Nina Tartibi 1F
Posts: 52
Joined: Wed Sep 30, 2020 9:58 pm

Re: Formal Charge vs Octet Rule

Postby Nina Tartibi 1F » Sat Nov 14, 2020 4:28 pm

You would start with octet rule so all the atoms in the molecule are stable, and then you would calculate formal charge, hopefully getting zero as the total FC.

Helena Xu 1I
Posts: 53
Joined: Wed Sep 30, 2020 9:51 pm
Been upvoted: 1 time

Re: Formal Charge vs Octet Rule

Postby Helena Xu 1I » Sat Nov 14, 2020 4:46 pm

Yes, you would focus on the octet rule first when drawing a Lewis structure, and then calculate formal charges to find the most stable structure.

Tobie Jessup 2E
Posts: 64
Joined: Wed Sep 30, 2020 10:02 pm

Re: Formal Charge vs Octet Rule

Postby Tobie Jessup 2E » Sun Nov 15, 2020 1:14 pm

Use the octet rule to first determine lewis structure but the lowest formal charge is used to determine which is most stable between difference resonance structures.


Return to “Formal Charge and Oxidation Numbers”

Who is online

Users browsing this forum: No registered users and 1 guest