## Formal charge?

Alondra Juarez section 1E
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Joined: Fri Sep 29, 2017 7:03 am

### Formal charge?

What is formal charge and how do we calculate it?

Kuldeep Gill 1H
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### Re: Formal charge?

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
Posts: 31
Joined: Fri Apr 06, 2018 11:04 am

### Re: Formal charge?

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
Posts: 20
Joined: Wed Nov 15, 2017 3:00 am

### Re: Formal charge?

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
Posts: 30
Joined: Fri Apr 06, 2018 11:01 am

### Re: Formal charge?

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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Joined: Fri Apr 06, 2018 11:03 am

### Re: Formal charge?

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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Joined: Mon Apr 09, 2018 1:39 pm

### Re: Formal charge?

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
Posts: 29
Joined: Tue Nov 21, 2017 3:00 am

### Re: Formal charge?

Would the equation:

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

also work?

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

### Re: Formal charge?

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

Endri Dis 1J
Posts: 33
Joined: Fri Apr 06, 2018 11:02 am

### Re: Formal charge?

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
Posts: 31
Joined: Fri Apr 06, 2018 11:05 am

### Re: Formal charge?

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

Allen Chen 1J
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Joined: Wed Nov 15, 2017 3:04 am

### Re: Formal charge?

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?

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)