Contribution to the resonance structure?

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Tyra Nguyen 4H
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Contribution to the resonance structure?

Postby Tyra Nguyen 4H » Wed Nov 14, 2018 4:24 pm

I was reading the textbook (6th Edition, page 90, section 3.12), and it described the resonance hybrid structure of a Cl2 molecule. The textbook states that "the ionic structures make only a small contribution to the resonance hybrid; the bond is almost purely covalent" but I don't really understand what that means?

Te Jung Yang 4K
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Re: Contribution to the resonance structure?

Postby Te Jung Yang 4K » Wed Nov 14, 2018 5:17 pm

The ionic structures are the models of Cl2 on the far left and right (with - and + charges assigned to a Cl, right above your quoted sentence).
Resonance describes delocalization of electrons.

From these notes, the sentence seems to be implying that, since in the Cl2 molecule the electrons in the covalent bond are shared almost equally (same electronegativity, but electrons behave as waves) there is hardly any ionic character and hence hardly any delocalization or resonance.

Cienna Henry 1J
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Re: Contribution to the resonance structure?

Postby Cienna Henry 1J » Sun Nov 18, 2018 10:07 am

But what exactly does it mean to contribute to a resonance structure?

404817859
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Re: Contribution to the resonance structure?

Postby 404817859 » Sun Nov 18, 2018 10:47 pm

One of a set of Lewis structures that differ only in the distribution of electrons in covalent bonds and lone pairs.


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