## Charges on Lewis Structures

Kellylin_4D
Posts: 66
Joined: Sat Aug 24, 2019 12:17 am

### Charges on Lewis Structures

if a compound is negatively charged, where do we put this extra electron?

sarahwu3a
Posts: 50
Joined: Sat Aug 17, 2019 12:17 am

### Re: Charges on Lewis Structures

If the compound is negatively charged the electrons should indicate so, the only thing you have to add are a minus sign and brackets around the molecule.

Izzie Capra 2E
Posts: 103
Joined: Sat Sep 07, 2019 12:19 am

### Re: Charges on Lewis Structures

I would be sure to check and make sure you have the correct number of valence electrons when you draw the structure. If not already indicated, you also have to account for the electron that is gained. You will most likely place that electron around the central atom. Then, you can place the brackets and negative charge around the molecule.

Ruth Glauber 1C
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Joined: Wed Sep 18, 2019 12:20 am

### Re: Charges on Lewis Structures

I think you should only have to make the positive or negative notation on the atom itself (eg. Na+).

Jorge Ramirez_4H
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Joined: Wed Nov 21, 2018 12:19 am

### Re: Charges on Lewis Structures

MinuChoi
Posts: 100
Joined: Wed Sep 18, 2019 12:15 am

### Re: Charges on Lewis Structures

A charge of -1 means that the compound has 1 extra electron (more electrons than protons means a negative charge). The Lewis structure would show an amount of electrons equal to the total of the atoms' valence electrons plus one.

For BrO3-, that would be 7+6+6+6+1=26 valence electrons.

Anvi Brahmbhatt 4A
Posts: 51
Joined: Wed Sep 18, 2019 12:21 am

### Re: Charges on Lewis Structures

Add the electron when counting how many valence electrons are present in the compound. Add the brackets and the negative sign around the structure after you have drawn it.

ABombino_2J
Posts: 102
Joined: Thu Jul 11, 2019 12:15 am

### Re: Charges on Lewis Structures

For a molecule with a +1 charge such as ammonium, NH4+, you would subtract one e- from the valence e- so the total valence e- would 8. For a molecule with a -1 share like sulfate, SO4^2-, you would add 2 extra valence e-. The result is 32. To draw the lewis structure, just be sure to satisfy the amount of valence electrons and try to keep formal charge as close to 0 as possible.