Contribution in Formal Charge

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Jesus A Cuevas - 1E
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Contribution in Formal Charge

Postby Jesus A Cuevas - 1E » Wed May 23, 2018 8:38 am

In the textbook, where it discusses the Correcting of the Covalent Model and the formal charge, they often mention "contribution" but I am not entirely sure what they are referring to in that. For example, in the section Correcting the Covalent Model the book states that because Chlorine has a greater attraction for the (e-) than Hydrogen does in the compound HCl, then the structure with the negative charge on the Chlorine makes a bigger "contribution" than if the negative charge was on the Hydrogen.

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Re: Contribution in Formal Charge

Postby Chem_Mod » Wed May 23, 2018 9:20 pm

A lewis structure that makes a greater "contribution" to the actual structure is a better representation of the actual structure.

This is referring to modeling a chemical as a blend or compilation of possible Lewis structures. The most stable or more likely structure makes a greater "contribution" to the blend (like with resonance structures).

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Re: Contribution in Formal Charge

Postby joannehaddad » Sun May 27, 2018 8:23 pm

It's basically the most stable structure, the one with the lowest energy.

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