Drawing Lewis Structures

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Selena Yu 1H
Posts: 108
Joined: Fri Aug 09, 2019 12:16 am

Drawing Lewis Structures

Postby Selena Yu 1H » Fri Oct 25, 2019 2:32 pm

Is there ever an exception where you won't choose the atom with the lowest ionization energy as the central atom?

Claire Lo 3C
Posts: 55
Joined: Sat Aug 17, 2019 12:18 am

Re: Drawing Lewis Structures

Postby Claire Lo 3C » Fri Oct 25, 2019 2:36 pm

Hydrogen in some cases has lower ionization energy than other atoms. But it's almost never used as the central atom, except if the molecule is H2.

Letty Liu 2C
Posts: 105
Joined: Fri Aug 09, 2019 12:16 am

Re: Drawing Lewis Structures

Postby Letty Liu 2C » Fri Oct 25, 2019 3:43 pm

Hydrogen can never be a central atom.

Bradley Whitworth 4B
Posts: 54
Joined: Sat Jul 20, 2019 12:17 am

Re: Drawing Lewis Structures

Postby Bradley Whitworth 4B » Fri Oct 25, 2019 3:58 pm

Only hydrogen. There will be cases though when maybe there are a few of the least electronegative ions that aren't hydrogen and they go in the center in different arrangements depending on how many there are. In the case of a fatty acid there are usually a bunch of carbons which in that case all go in a straight line in the center. In other cases like benzene a ring is formed so it differs.

Nicholas_Gladkov_2J
Posts: 125
Joined: Sat Aug 17, 2019 12:17 am

Re: Drawing Lewis Structures

Postby Nicholas_Gladkov_2J » Fri Oct 25, 2019 11:14 pm

Selena Yu 1I wrote:Is there ever an exception where you won't choose the atom with the lowest ionization energy as the central atom?


I believe that unless there's only two atoms in the molecule (no central atom), or there's a molecule that doesn't really have any central atom (Bradly mentioned a fatty acid), the atom with the lowest ionization energy will be the central atom.
Hydrogen can only make one bond, which is why it can't be central.

Viviana Velasquez
Posts: 97
Joined: Sat Jul 20, 2019 12:15 am

Re: Drawing Lewis Structures

Postby Viviana Velasquez » Sat Oct 26, 2019 5:31 pm

Hydrogen is an exception. It will never be the central atom.

Arianna Perea 3H
Posts: 50
Joined: Thu Jul 25, 2019 12:17 am

Re: Drawing Lewis Structures

Postby Arianna Perea 3H » Sat Oct 26, 2019 9:30 pm

If you leave a lone pair instead of making it a bond, would it be considered wrong?

Pablo 1K
Posts: 118
Joined: Sat Feb 02, 2019 12:15 am

Re: Drawing Lewis Structures

Postby Pablo 1K » Sat Oct 26, 2019 9:33 pm

Arianna Perea 3H wrote:If you leave a lone pair instead of making it a bond, would it be considered wrong?

It depends on the structure as a whole and the overall charge. Try to make bonds but keeping ion mind the overall charge.

RobertXu_2J
Posts: 104
Joined: Fri Aug 30, 2019 12:17 am

Re: Drawing Lewis Structures

Postby RobertXu_2J » Sat Oct 26, 2019 9:43 pm

Hydrogen is never used as the central atom.


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