Formal charge?

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Alondra Juarez section 1E
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Formal charge?

Postby Alondra Juarez section 1E » Sun May 20, 2018 3:56 pm

What is formal charge and how do we calculate it?

Kuldeep Gill 1H
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Re: Formal charge?

Postby Kuldeep Gill 1H » Sun May 20, 2018 3:58 pm

Hi, you take the number of valence electrons minus half the number of shared electrons minus the number of unshared electrons. This will give you the formal charge of that atom!

sylvie_1D
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Re: Formal charge?

Postby sylvie_1D » Sun May 20, 2018 10:58 pm

The purpose of formal charge is to find the lowest energy state possible for the molecule. Formal charge predicts what arrangment of atoms a molecule is most likely to be found in and create s a lewis structure with the lowest energy (0)

CarinaVargas1J
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Re: Formal charge?

Postby CarinaVargas1J » Sun May 20, 2018 11:23 pm

Formal Charge= # of valence electrons on atom- lone pair electrons + # of bonds
Last edited by CarinaVargas1J on Thu May 24, 2018 4:45 pm, edited 2 times in total.

Sonia Aronson 1B
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Re: Formal charge?

Postby Sonia Aronson 1B » Mon May 21, 2018 11:14 pm

The equation for finding formal charge is:
Formal Charge= [# of valence electrons on atom]- [lone pair electrons + # of bonds]

Erin Li 1K
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Re: Formal charge?

Postby Erin Li 1K » Wed May 23, 2018 1:20 am

you calculate formal charge by using the equation
number of valence electrons - number of lone electrons and number of bonds

Sarai Ventura 1L
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Re: Formal charge?

Postby Sarai Ventura 1L » Thu May 24, 2018 4:59 pm

According to the book formal charge is the electric charge of an atom in a molecule assigned on the assumption that the bonding is nonpolar covalent. Formal Charge (FC)= number off valence electrons in the free atom-(number of lone pair electrons+1/2 x number of shared electrons). However, since the “number of bonding electrons divided by 2” term is also equal to the number of bonds surrounding the atom, here's the shortcut formula: Formal Charge = [# of valence electrons on atom] – [non-bonded electrons + number of bonds].

hannahtweedy
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Joined: Tue Nov 21, 2017 3:00 am

Re: Formal charge?

Postby hannahtweedy » Thu May 24, 2018 5:38 pm

Would the equation:

valence electrons - non-bonding valence electrons - (bonding electrons/2)

also work?

MadelynNguyen1F
Posts: 59
Joined: Fri Apr 06, 2018 11:04 am

Re: Formal charge?

Postby MadelynNguyen1F » Thu May 24, 2018 8:06 pm

Yes! The equation [valence electrons - non-bonding valence electrons - (bonding electrons/2) ] would also work

Endri Dis 1J
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Re: Formal charge?

Postby Endri Dis 1J » Thu May 24, 2018 10:15 pm

Yeah there is a very easy way to calculate it, all you have to do is get the valence electrons from that atom and subtract both the lone pairs and the bond pairs.

Sara Veerman-1H
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Re: Formal charge?

Postby Sara Veerman-1H » Fri May 25, 2018 12:07 pm

Formal Charge = (# of valence e-) – (# of lone pair e-) – (1/2)(# of bonded e-)

Allen Chen 1J
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Re: Formal charge?

Postby Allen Chen 1J » Fri May 25, 2018 2:04 pm

The formal charge is the # of valence electrons – # of lone pair electrons – (1/2)(# of bonded electrons

Maria Zamarripa 1L
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Re: Formal charge?

Postby Maria Zamarripa 1L » Fri Jun 01, 2018 1:14 pm

The equation for the formal charge is, formal charge = V - (L+1/2(B)) V= # of valence electron of the element, L= # of lone pairs surrounding the atom (count each electron), B= bonded pairs (count each electron)


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