Creating a Lewis Stucture

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Melissa_Aguirre1J
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Joined: Tue Nov 14, 2017 3:02 am

Creating a Lewis Stucture

Postby Melissa_Aguirre1J » Thu May 17, 2018 9:35 am

I know that the element with the lowest ionization energy goes in the middle, but, when you have a lot of elements, how do you determine which ones go on the side of it and on top of it?

Melissa_Aguirre1J
Posts: 38
Joined: Tue Nov 14, 2017 3:02 am

Re: Creating a Lewis Stucture

Postby Melissa_Aguirre1J » Thu May 17, 2018 9:35 am

An example of this would be H2C(NH2)COOH

Melissa_Aguirre1J
Posts: 38
Joined: Tue Nov 14, 2017 3:02 am

Re: Creating a Lewis Stucture

Postby Melissa_Aguirre1J » Thu May 17, 2018 9:37 am

Another example would be CH3CH2OH

octaviahuang1f
Posts: 30
Joined: Fri Apr 06, 2018 11:03 am

Re: Creating a Lewis Stucture

Postby octaviahuang1f » Thu May 17, 2018 11:59 am

I don't think this was really covered in class, but for H2C(NH2)COOH, it has a carboxylic acid (R-COOH) and an amidogen (NH2-). That leaves the central atom with lowest ionization energy, which is carbon. The carbon goes in the middle, and NH2- and R-COOH go on both sides. Finally the two hydrogen goes on the central carbon.
Hope this helps!! :)
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H2C(NH2)COOH.jpg

Johanna Caprietta 1E
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Re: Creating a Lewis Stucture

Postby Johanna Caprietta 1E » Thu May 17, 2018 7:23 pm

I remember in class Lavelle said the Hydrogen is the exception in which it does not complete an octet. So when you're looking at molecules, hydrogen should never be in the middle if the molecule has a lot of valence electrons. You would then have to look at the next lowest energy if that makes any sense.

204917020
Posts: 31
Joined: Fri Apr 06, 2018 11:05 am

Re: Creating a Lewis Stucture

Postby 204917020 » Fri May 18, 2018 4:47 pm

I don't think it matters where you put the rest of the elements around the center as long as you satisfy the proper formal charge and octets(or duets).

Kuldeep Gill 1H
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Re: Creating a Lewis Stucture

Postby Kuldeep Gill 1H » Sat May 19, 2018 9:43 am

Hydrogen cannot be in the middle because it is only able to form one bond.

Samantha Draghi 1L
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Re: Creating a Lewis Stucture

Postby Samantha Draghi 1L » Sat May 19, 2018 12:41 pm

I believe withe the exception off hydrogen you start with the lowest ionization energy element and since there will be multiple central atoms you can just build from there as long as when you are finished you satisfy the correct formal charge

Vienna Cimetta 1L
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Joined: Thu Feb 01, 2018 3:01 am

Re: Creating a Lewis Stucture

Postby Vienna Cimetta 1L » Sun May 20, 2018 1:15 pm

Honestly i think it all just comes down to trial and error. Once you have the central atom you just have to place the others in a way to find the lowest formal charge. If you see something an element with a +1 charge, try to take a lone pair from an adjacent element and create a double bond. Sometimes that's a trick to neutralize the charge.


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