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Polyatomic Lewis Structures

Posted: Sun Jul 09, 2017 10:20 pm
by Yolandia Winn 1A
Why is it that we add/subtract electrons when creating lewis structures? (ex if it is molecule3+, we'd subtract 3 electrons from the entire model)

Re: Polyatomic Lewis Structures

Posted: Sun Jul 09, 2017 11:57 pm
by 604807557
Anions gain electrons, cations lose electrons

Re: Polyatomic Lewis Structures

Posted: Tue Jul 11, 2017 11:06 pm
by Wu Yuchen A1
ions form when losing/ gaining several electrons, thus when drawing Lewis structure we should add/subtract electrons.

Re: Polyatomic Lewis Structures

Posted: Sat Jul 15, 2017 8:37 am
by Paul Wong1B
If a molecule has a charge of 3+, it means that the molecule has 3 less electrons than it normally does. This would mean that you use 3 electrons less on the diagram than you would if you were drawing the ground state diagram. On the other hand, if a molecule were to have a 3- charge, then it would prompt an addition of 3 electrons into the lewis dot structure of the molecule.

Re: Polyatomic Lewis Structures

Posted: Sat Jul 15, 2017 11:46 pm
by Natalie Espadas 1A
I agree with Paul. It gets a little confusing when we are shown 2+ or 2- for example because you are technically doing the opposite.
If it shows 2+, then you are removing. If it shows 2-, then you are adding.

Re: Polyatomic Lewis Structures

Posted: Fri Oct 27, 2017 5:42 pm
by Manasvi Paudel 1A
The polyatomic ions aren't their usual, balanced charge so when something is 3+, it means that it has three less electrons that it would normally. Anions gain electrons and Cations lose them. When you draw lewis structures, people usually write the charge in the upper right to differentiate !