Resonance Structures

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Resonance Structures

Postby salvadorramos3k » Sun Nov 10, 2019 4:20 pm

Will there ever be a time where a molecule has an element that does not have a complete octet? Also, if you draw a resonance structure with an incomplete octet, is it still valid but just very unstable? What should a "correct" resonance structure look like?

Haley Fredricks 1B
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Re: Resonance Structures

Postby Haley Fredricks 1B » Sun Nov 10, 2019 4:29 pm

There are very few exceptions to the octet rule (in terms of it not being completed). Boron and Aluminum are the two that most often don't complete an octet (having 6 valence electrons instead of 8)

Matthew Tsai 2H
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Re: Resonance Structures

Postby Matthew Tsai 2H » Sun Nov 10, 2019 4:37 pm

The common exceptions of atoms that do not require at least a full octet are the first four elements, along with boron and aluminum. Otherwise, there aren't really any naturally occurring examples of an element that doesn't fill its octet so any resonance structures that break the rule wouldn't be valid.

Amy Kumar 1I
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Re: Resonance Structures

Postby Amy Kumar 1I » Sun Nov 10, 2019 4:54 pm

For boron, not having an octet and having just 6 shared electrons makes it formal charge 0 since it has 6 valence electrons. This is favorable for boron rather than having a complete octet.

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