Lowest energy lewis structure
Moderators: Chem_Mod, Chem_Admin
-
- Posts: 31
- Joined: Fri Apr 06, 2018 11:02 am
Lowest energy lewis structure
Can someone explain how to determine the lowest energy Lewis structure of a molecule and maybe provide an example.
-
- Posts: 38
- Joined: Fri Apr 06, 2018 11:02 am
Re: Lowest energy lewis structure
You want all formal charge to be 0 or closest to 0 when there is a charge on the molecule.
-
- Posts: 48
- Joined: Fri Apr 06, 2018 11:04 am
Re: Lowest energy lewis structure
This thread might help.
viewtopic.php?f=33&t=31624&p=103217&hilit=Lewis+structures&sid=450ab185a9474d380218e0e88a8cc6d7#p103217
"formal charge purpose" is the title of the thread.
Basically you draw a Lewis structure and then calculate the formal charge of every atom. Then, you draw double/triple bonds, make an expanded octet, or move around the atoms to try to make formal charge for each atom as close to 0 as possible.
You can also search up "stable lewis structures" in Chemistry Community for examples of finding the most stable Lewis structure.
viewtopic.php?f=33&t=31624&p=103217&hilit=Lewis+structures&sid=450ab185a9474d380218e0e88a8cc6d7#p103217
"formal charge purpose" is the title of the thread.
Basically you draw a Lewis structure and then calculate the formal charge of every atom. Then, you draw double/triple bonds, make an expanded octet, or move around the atoms to try to make formal charge for each atom as close to 0 as possible.
You can also search up "stable lewis structures" in Chemistry Community for examples of finding the most stable Lewis structure.
-
- Posts: 44
- Joined: Fri Apr 06, 2018 11:02 am
- Been upvoted: 1 time
Re: Lowest energy lewis structure
To determine the lowest energy Lewis structure you are going to want to find the formal charge of each atom and add up all the charges. If you find that you can cancel one of the charges out by adding a double bond then do that. You also want to get as close to one charge as possible so either all positive or all negative even though there are some cases where you just can't cancel out two different charges. Hope that helps!
Re: Lowest energy lewis structure
you want to make sure your bonds will make sure that the formal charge is the lowest.
-
- Posts: 30
- Joined: Fri Apr 06, 2018 11:04 am
- Been upvoted: 1 time
Re: Lowest energy lewis structure
The Lewis structure with the lowest energy will be the one with the lowest formal charge overall. Also, if the individual atoms have formal charges not equal to zero, its best to put opposite charges next to one another.
Who is online
Users browsing this forum: No registered users and 7 guests