Bonds or Lone Pairs more important?

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Jared Pagal 1J
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Joined: Fri Apr 06, 2018 11:04 am

Bonds or Lone Pairs more important?

Postby Jared Pagal 1J » Sun May 13, 2018 4:59 pm

When constructing a resonance structure, is it more common to add double bonds between atoms or lone pairs to the central atom to balance out the number of valence electrons?

Heung Ching Chia 1E
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Joined: Mon Apr 09, 2018 1:38 pm

Re: Bonds or Lone Pairs more important?

Postby Heung Ching Chia 1E » Sun May 13, 2018 5:53 pm

I don't think there is a general rule as to whether you should add lone pairs or double bonds between atoms to the central atom to achieve a stable octet of electrons. It just depends on the molecule itself and what would make a structure with the lowest formal charge possible for the lewis structure of the molecule.

alexagreco1A
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Joined: Fri Apr 06, 2018 11:03 am

Re: Bonds or Lone Pairs more important?

Postby alexagreco1A » Sun May 13, 2018 7:12 pm

I do not believe that there is a rule as to which comes first, but I would think that a double bond would come before an expanded octet.

yazminedesan1F
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Joined: Thu Feb 15, 2018 3:00 am

Re: Bonds or Lone Pairs more important?

Postby yazminedesan1F » Sun May 13, 2018 8:48 pm

This really depends on the molecule and you'd have to access where a single or double bond should be fit

Rummel Requerme 1E
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Re: Bonds or Lone Pairs more important?

Postby Rummel Requerme 1E » Sun May 20, 2018 4:47 pm

I agree with Heung. There is no particular rule to follow if double bonds are prioritized over lone pairs. It's a matter of minimizing the formal charge, but also taking into consideration the capabilities (bond-wise) of a given atom.

Amir Akhavan 1E
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Joined: Fri Apr 06, 2018 11:01 am

Re: Bonds or Lone Pairs more important?

Postby Amir Akhavan 1E » Sun May 20, 2018 10:34 pm

There is no general rule to follow when it comes to this. Every situation should be assessed differently.

Rummel Requerme 1E
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Re: Bonds or Lone Pairs more important?

Postby Rummel Requerme 1E » Sun May 27, 2018 7:40 pm

They are both equally important. This is because each contributes their respective characteristics to an atom.

Molly Oakes 1A
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Re: Bonds or Lone Pairs more important?

Postby Molly Oakes 1A » Sun May 27, 2018 7:48 pm

I believe they are of equal importance, but formal charge clarifies which one you should use in each situation.


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