Formal Charge

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Nicole Garrido 2I
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Joined: Fri Sep 28, 2018 12:18 am

Formal Charge

Postby Nicole Garrido 2I » Wed Nov 07, 2018 12:54 pm

Is it better for the central element of the outside elements to have a charge? Why?

RachaelKoh3A
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Joined: Fri Sep 28, 2018 12:25 am

Re: Formal Charge

Postby RachaelKoh3A » Wed Nov 07, 2018 12:58 pm

I think it depends on the electronegativity of the atom. For example in SO3-, the O will more likely take on the negative charge because it is more electronegative than S and hence will draw electrons more strongly to itself compared to S.
Last edited by RachaelKoh3A on Wed Nov 07, 2018 1:08 pm, edited 1 time in total.

Amy Dinh 1A
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Joined: Fri Sep 28, 2018 12:23 am

Re: Formal Charge

Postby Amy Dinh 1A » Wed Nov 07, 2018 1:03 pm

I agree with Rachael. It depends on the electronegativity of the atom. Whatever element is the most electronegative in the compound should have the charge. It doesn't have to be specifically the central atom or the outer one.

ThomascnguyenDis1J
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Joined: Fri Sep 28, 2018 12:16 am

Re: Formal Charge

Postby ThomascnguyenDis1J » Sun Nov 11, 2018 3:08 pm

An easy way to remember how to find formal charge is take the atom's valence electrons and subtract it with the number of dots and lines around it on the lewis structure

Soumya Ravichandran 4H
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Joined: Fri Sep 28, 2018 12:19 am

Re: Formal Charge

Postby Soumya Ravichandran 4H » Sun Nov 11, 2018 4:22 pm

Obviously there are exceptions, but I think that it is better to have no formal charge on the central atom in order to have the Lewis Structure of the lowest energy and most stability. Also, if you add up the formal charges of all the elements it should equal the charge of the compound.

Lasya Gudipudi 1A
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Re: Formal Charge

Postby Lasya Gudipudi 1A » Sun Nov 11, 2018 5:07 pm

I agree that the formal charge should be close to 0 on the central atom and if there are any charges they should be on the outer elements. It is also important to look at electronegativity, but the least electronegative element is more likely to be the central atom, so this follows the pattern that charge in on outer elements.

Sang Hyoun Hong 3G
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Joined: Fri Sep 28, 2018 12:27 am

Re: Formal Charge

Postby Sang Hyoun Hong 3G » Sun Nov 11, 2018 5:18 pm

Generally, although there are exceptions, the central atom should have a formal charge of zero for it to be most stable.

Kevin Arokiaraj 4E
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Joined: Wed Nov 15, 2017 3:03 am

Re: Formal Charge

Postby Kevin Arokiaraj 4E » Sun Nov 11, 2018 7:27 pm

I agree, usually the central atom has a charge of 0 in order for it to be more stable.

yuetao4k
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Re: Formal Charge

Postby yuetao4k » Mon Nov 12, 2018 12:15 am

To let the structure be as stable as possible, a charge of 0 is the most stable. The outer elements can have a charge as long as the charges are symmetrical for it to still be stable.

Abhi4F
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Joined: Fri Sep 28, 2018 12:28 am

Re: Formal Charge

Postby Abhi4F » Wed Nov 14, 2018 7:18 pm

Generally, the more electronegative atoms have charges and the central atoms dont have charges for it to be most stable.

Tatum Keichline 2B
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Joined: Fri Sep 28, 2018 12:26 am

Re: Formal Charge

Postby Tatum Keichline 2B » Wed Nov 14, 2018 8:29 pm

Just try to get formal charges to equal zero or match the charge that the molecule is supposed to have.

Alyssa Wilson 2A
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Re: Formal Charge

Postby Alyssa Wilson 2A » Wed Nov 14, 2018 8:46 pm

To add to the previous replies, the most stable structure would be the one with all of the atoms having a formal charge of zero. Usually we want the central atom to have a formal charge of zero, and if the whole molecule has a charge on it, then the outer atoms could have a formal charge that doesn't equal zero...either being positive or negative.

Diana Sandoval 1K
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Re: Formal Charge

Postby Diana Sandoval 1K » Wed Nov 14, 2018 10:21 pm

Like others have said, with formal charge your most stable Lewis structure is when they all have a FC of 0, but if that isn't possible you usually want your central atom to have a formal charge of 0 for it to be stable.

Zubair Ahmed 1L
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Joined: Fri Sep 28, 2018 12:16 am

Re: Formal Charge

Postby Zubair Ahmed 1L » Wed Nov 14, 2018 10:35 pm

When drawing Lewis structures for ions, it is best of the central atom to have a formal charge of 0 and to place any negative charge on the outer elements because that is when it is most stable.

Yixiao Hu 3C
Posts: 45
Joined: Fri Sep 28, 2018 12:19 am

Re: Formal Charge

Postby Yixiao Hu 3C » Thu Nov 15, 2018 12:31 am

I think it is better to have zero formal charge on the central atom; though the electronegativity is also very important, the formal charge of the central atom is more important


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