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Formal Charge

Posted: Wed Nov 07, 2018 12:54 pm
by Nicole Garrido 2I
Is it better for the central element of the outside elements to have a charge? Why?

Re: Formal Charge

Posted: Wed Nov 07, 2018 12:58 pm
by RachaelKoh3A
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.

Re: Formal Charge

Posted: Wed Nov 07, 2018 1:03 pm
by Amy Dinh 1A
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.

Re: Formal Charge

Posted: Sun Nov 11, 2018 3:08 pm
by ThomascnguyenDis1J
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

Re: Formal Charge

Posted: Sun Nov 11, 2018 4:22 pm
by Soumya Ravichandran 4H
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.

Re: Formal Charge

Posted: Sun Nov 11, 2018 5:07 pm
by Lasya Gudipudi 1A
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.

Re: Formal Charge

Posted: Sun Nov 11, 2018 5:18 pm
by Sang Hyoun Hong 3G
Generally, although there are exceptions, the central atom should have a formal charge of zero for it to be most stable.

Re: Formal Charge

Posted: Sun Nov 11, 2018 7:27 pm
by Kevin Arokiaraj 4E
I agree, usually the central atom has a charge of 0 in order for it to be more stable.

Re: Formal Charge

Posted: Mon Nov 12, 2018 12:15 am
by yuetao4k
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.

Re: Formal Charge

Posted: Wed Nov 14, 2018 7:18 pm
by Abhi4F
Generally, the more electronegative atoms have charges and the central atoms dont have charges for it to be most stable.

Re: Formal Charge

Posted: Wed Nov 14, 2018 8:29 pm
by Tatum Keichline 2B
Just try to get formal charges to equal zero or match the charge that the molecule is supposed to have.

Re: Formal Charge

Posted: Wed Nov 14, 2018 8:46 pm
by Alyssa Wilson 2A
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.

Re: Formal Charge

Posted: Wed Nov 14, 2018 10:21 pm
by Diana Sandoval 1K
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.

Re: Formal Charge

Posted: Wed Nov 14, 2018 10:35 pm
by Zubair Ahmed 1L
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.

Re: Formal Charge

Posted: Thu Nov 15, 2018 12:31 am
by Yixiao Hu 3C
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