HW Problem 4.13c

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Justin Chu 1G
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HW Problem 4.13c

Postby Justin Chu 1G » Mon Nov 13, 2017 9:29 pm

For the Lewis structure for iodate, the solutions manual gives it to be central atom I with with 3 single bonds connected to the 3 O. Based off formal charge, wouldn't we rather have 3 double bonds to connect the 3 O and then just leave the FC on the central I to be -1?

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Re: HW Problem 4.13c

Postby ConnorThomas2E » Mon Nov 13, 2017 9:50 pm

I believe that this is just one of the resonance structures, and typically the Lewis structure for iodate has iodine double bonded to 2 of the oxygens and single bonded to a third with a lone electron pair.

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Re: HW Problem 4.13c

Postby Kyung_Jin_Kim_1H » Mon Nov 20, 2017 12:00 am

Adding onto the previous answer, a lewis structure with two double bonded and one single bonded oxygen would allow iodine and two oxygens to have a formal charge of 0 and one oxygen to have a formal charge of -1. This makes sense since oxygen is more electronegative than iodine and will have a slightly stronger pull on the electron than iodine, making it more likely to have a negative charge than iodine.

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