Resonance

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Jessica Esparza 2H
Posts: 130
Joined: Wed Sep 18, 2019 12:15 am

Resonance

Postby Jessica Esparza 2H » Tue Jan 14, 2020 9:57 am

Hello, I was wondering why the N2H2 structure did not have resonance but the others did. Is there any rule for when something has resonance? Thank you.
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Paul Hage 2G
Posts: 105
Joined: Thu Jul 25, 2019 12:17 am

Re: Resonance

Postby Paul Hage 2G » Tue Jan 14, 2020 10:08 am

The N2H2 structure does not have resonance because there is only one Lewis structure that satisfies the octet rule for N and also uses the 12 valence electrons in the molecule. If you remove one lone pair from each of the Nitrogen atoms to create a triple bond between them, the resulting Lewis structure would have 10, not 12, valence electrons. To determine whether a molecule has resonance, you would check the Lewis structure and see whether or not a lone pair can be used to create a bond while simultaneously using the total number of valence electrons in the molecule. In the second picture you posted, there is resonance because one of the lone pairs on the N atom was used to create another bond between N and C (and it did not change the number of valence electrons in the molecule). Therefore, there is resonance in that molecule.

Nan_Guan_1L
Posts: 84
Joined: Wed Sep 30, 2020 9:59 pm

Re: Resonance

Postby Nan_Guan_1L » Sat Oct 17, 2020 7:05 am

to check whether a molecule has a resonance or not, draw the lewis structure and see if you can find multiple possibilities that satisfy the requirement. N2H2 doesn't have a resonance structure because there's only one way to meet all the requirements.


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