Determining Resonance


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Samantha Rundle 3K
Posts: 22
Joined: Fri Sep 25, 2015 3:00 am

Determining Resonance

Postby Samantha Rundle 3K » Sun Oct 25, 2015 12:24 pm

Is there a quicker way to determine if there are resonance structures, other than calculating formal charge? If so, how?

Thanks!

HoganFenster2E
Posts: 23
Joined: Fri Sep 25, 2015 3:00 am

Re: Determining Resonance

Postby HoganFenster2E » Sun Oct 25, 2015 1:22 pm

I think that you usually need to calculate the formal charges. It is a good way to check your work too, especially if the compound has a negative or positive charge, because it must have that charge. Also, a little shortcut is (I'm not sure how helpful this is) that whenever you have an Oxygen with a double bond and two lone pairs the charge will always be zero. You can also figure out when atoms will have a formal charge of zero and just memorize them. Thats what I do and it goes a little quicker.

Jessica Chern 1H
Posts: 22
Joined: Sat Jul 09, 2016 3:00 am

Re: Determining Resonance

Postby Jessica Chern 1H » Sat Oct 22, 2016 6:22 pm

Also, if an atom is double bonded to one atom of a certain element X as well as single bonded to more atoms of that same element X (that aren't also bonded to anything else), there will be resonance.

Wang_Pong_Chan_1L
Posts: 10
Joined: Wed Sep 21, 2016 2:59 pm

Re: Determining Resonance

Postby Wang_Pong_Chan_1L » Sun Oct 23, 2016 7:03 pm

First makes the octet on each of the elements, then using the electrons needed figure out the double bonds, which will show you whether there is resonance or not.


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