Resonance and Formal Charge


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605208780
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Joined: Wed Sep 18, 2019 12:16 am

Resonance and Formal Charge

Postby 605208780 » Tue Dec 03, 2019 12:48 pm

Why do different resonance structures have different formal charges and how do we know which is the major contributor.

Kishan Shah 2G
Posts: 132
Joined: Thu Jul 11, 2019 12:15 am

Re: Resonance and Formal Charge

Postby Kishan Shah 2G » Tue Dec 03, 2019 12:50 pm

Different resonance structures may have different formal charges for the atoms that are double bonded in one and are single bonded in the other. Just look at the overall charge of the molecule and make sure your formal charges add up.

Althea Zhao 1B
Posts: 101
Joined: Mon Jun 17, 2019 7:24 am

Re: Resonance and Formal Charge

Postby Althea Zhao 1B » Tue Dec 03, 2019 4:59 pm

The major contributor is the most stable, where the central atom's charge is close to 0.

Sara Richmond 2K
Posts: 110
Joined: Fri Aug 30, 2019 12:16 am

Re: Resonance and Formal Charge

Postby Sara Richmond 2K » Tue Dec 03, 2019 5:02 pm

The major contributor is the most stable resonance structure, where the central atom's charge is closest to 0. To determine charge of a molecule add all of the formal charges together.

KnarGeghamyan1B
Posts: 102
Joined: Fri Aug 09, 2019 12:15 am

Re: Resonance and Formal Charge

Postby KnarGeghamyan1B » Tue Dec 03, 2019 5:03 pm

The formal charges differ because in some structures, the atoms have double bonds, single bonds, or Lone pairs. The major contributor is the one closest to a 0 total formal charge, and if that isn't possible usually the central atom should have 0 charge unless it violates the octet rule.


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