Determining Lewis structures

Moderators: Chem_Mod, Chem_Admin

Mannat Sukhija 1E
Posts: 23
Joined: Fri Jul 22, 2016 3:00 am

Determining Lewis structures

Postby Mannat Sukhija 1E » Tue Nov 01, 2016 7:30 am

When given the choice between drawing a Lewis structure that has the overall smallest formal charge or one that has a smaller charge for the central atom, which one is deemed more correct?

Posts: 19496
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 878 times

Re: Determining Lewis structures

Postby Chem_Mod » Tue Nov 01, 2016 9:55 am

Typically the smallest formal charge on each atom is the best Lewis structure as long as all atoms have at least an octet. However, it is best to have negative formal charges on the most electronegative atoms and vice versa.

Christian Hardoy 3F
Posts: 41
Joined: Fri Jul 15, 2016 3:00 am

Re: Determining Lewis structures

Postby Christian Hardoy 3F » Tue Nov 01, 2016 10:34 am

The best lewis structure might also be a resonance hybrid structure if the molecule is more stable with delocalized electrons. Therefore, the formal charges could vary depending on the different resonance structures.

Posts: 51
Joined: Wed Sep 21, 2016 2:58 pm

Re: Determining Lewis structures

Postby Joslyn_Santana_2B » Sun Dec 04, 2016 10:46 am

Does anyone know why the most stable lewis structure for NO2 has charges on N and one of the O's, when there is a structure where all the FC's can be 0?
Screen Shot 2016-12-04 at 10.46.23 AM.png

Jennah Muhammad 1H
Posts: 16
Joined: Sat Jul 09, 2016 3:00 am

Re: Determining Lewis structures

Postby Jennah Muhammad 1H » Sun Jul 09, 2017 10:38 pm

when drawing a lewis structure how do you determine where to place the lone pair if there is one

Return to “Lewis Structures”

Who is online

Users browsing this forum: No registered users and 1 guest