## ranking

Karyn Nguyen 1K
Posts: 72
Joined: Fri Apr 06, 2018 11:04 am

### ranking

How do we rank resonance structures in order of importance to the overall structure?

annie_finneran_1K
Posts: 37
Joined: Fri Apr 06, 2018 11:02 am

### Re: ranking

by the formal charge. The most important is the lowest energy and the one with formal charges on each element closest to zero as possible.

vivianndo_1L
Posts: 30
Joined: Fri Apr 06, 2018 11:02 am

### Re: ranking

If the two resonance structures have the same formal charge, would they be considered equal in rank?

Harmonie Ahuna-1C
Posts: 30
Joined: Fri Apr 06, 2018 11:01 am

### Re: ranking

vivianndo_1L wrote:If the two resonance structures have the same formal charge, would they be considered equal in rank?

I believe so

Isabel Jabara 1C
Posts: 34
Joined: Fri Apr 06, 2018 11:03 am

### Re: ranking

If they have the same formal charge overall, choose the one with the smallest individual formal charges. For example, if one of them has -2 and 2, so the formal charge is 0, and the other has all 0's, the one with all 0's is ranked higher.

breannasung_1K
Posts: 30
Joined: Fri Apr 06, 2018 11:05 am

### Re: ranking

You rank the resonance structures based off the formal charges you find for each atom in the structure. The structure with the formal charge of 0 for the central atom is the most stable.

Nandhini_2K
Posts: 60
Joined: Fri Apr 06, 2018 11:03 am

### Re: ranking

By formal charge starting from the lowest close to the zero.

Sophie W
Posts: 17
Joined: Fri Apr 06, 2018 11:05 am

### Re: ranking

you calculate the formal charge of all the atoms, since the most stable structure will see that all atoms have formal charges close to zero

Rummel Requerme 1E
Posts: 35
Joined: Fri Sep 25, 2015 3:00 am
Been upvoted: 1 time

### Re: ranking

Calculate formal charge and try your best to have to be as close to 0 as possible.

Shione Nakahara 1F
Posts: 31
Joined: Fri Apr 06, 2018 11:04 am

### Re: ranking

A resonance structure has a greater importance if it fulfills the octet rule and if it has minimum charge separation. In addition, there should be no like charges on atoms that are next to each other.

Karyn Nguyen 1K
Posts: 72
Joined: Fri Apr 06, 2018 11:04 am

### Re: ranking

vivianndo_1L wrote:If the two resonance structures have the same formal charge, would they be considered equal in rank?

Resonance structures are supposed to have the same formal charge, but they can differ in rank.

John Miller-1I
Posts: 29
Joined: Fri Apr 06, 2018 11:04 am

### Re: ranking

There can be many different resonance structures, but the ones with the lowest formal charge contribute the most to the resonance