Formal Charge  [ENDORSED]

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Lilyana Villa 1J
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Formal Charge

Postby Lilyana Villa 1J » Sun Oct 27, 2019 10:28 pm

Can someone explain what formal charge is and how you calculate it? Thank you

Akshay Chellappa 1H
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Joined: Wed Sep 11, 2019 12:15 am

Re: Formal Charge  [ENDORSED]

Postby Akshay Chellappa 1H » Sun Oct 27, 2019 10:32 pm

Formal charge is the charge which is assigned to an atom in a molecule. To calculate formal charge you add the number of lone pair electrons to half of the number of bound electrons, and subtract the sum from the number of valence electrons.

Marty Hockey
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Re: Formal Charge

Postby Marty Hockey » Sun Oct 27, 2019 10:33 pm

The formal charge of an atom indicates gain or loss of electrons while forming a covalent bond. To determine formal charge, count the number of shared electrons (s), count each number of lone pair electron (L) and then follow the formula: FC (formal charge) = V (valence electrons) - (L + s/2)

Kayli Choy 2F
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Re: Formal Charge

Postby Kayli Choy 2F » Tue Oct 29, 2019 11:09 am

Additionally, if your molecule is charged, the sums each of the formal charges of the atoms should equal the total charge of the molecule. The Lewis structure in which formal charges of individual atoms are closest to zero represents the lowest energy arrangement.

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Re: Formal Charge

Postby EricZhao3G » Wed Oct 30, 2019 2:03 am

Formal charge is the charge assigned to an atom assuming the electrons are shared equally. You calculate formal charge with the equation FC = V - (L + S/2) where FC = formal charge, V = valence electrons, L = lone pair electrons, and s = shared electrons of that specific atom.

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Re: Formal Charge

Postby Veronica_Lubera_2A » Wed Oct 30, 2019 9:17 am

In the formula, instead of using S/2 I just count the number of bonds with that atom and you get the same answer. I think it's a little bit easier since you don't have to divide by two and can subtract that exact number.

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Re: Formal Charge

Postby lauraxie2e » Wed Oct 30, 2019 10:36 am

Formal charge is the charge assigned to a bonded atom. The formula is FC=V-(LP+0.5BP)

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