2C.3 (7th edition)

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Milena Aragon 2B
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Joined: Fri Sep 28, 2018 12:19 am

2C.3 (7th edition)

Postby Milena Aragon 2B » Sun Nov 04, 2018 2:58 pm

"Draw the Lewis structure, including typical contributions to the resonance structure for
a)periodate ion (IO4-)

the solutions manual said that this molecule had 4 resonance structures because it alternated the positions of the three double bonds. However, I found three other structures (one with 4 double bonds and 2 with 2 double bonds with the positions alternated). Why aren't these structures included in the # of resonance structures that the molecule has? Is it because they don't result in Iodine having a 0 formal charge? And if that's the case, is it always like that? Where the only resonance structures that count are those that result in the central atom having a 0 charge?

Matthew Mar 1J
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Joined: Fri Sep 28, 2018 12:15 am
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Re: 2C.3 (7th edition)

Postby Matthew Mar 1J » Sun Nov 04, 2018 4:09 pm

I'm pretty sure the only structures considered to be resonance structures are those that have a neutral charge (or if it's an ion, at least the same charge). Resonance structures blend together into one hybrid structure that represents the actual molecule with averaged bond lengths. All the different structures just change the arrangement of electrons but stay essentially the same, so structures with different charges probably won't match up together.


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