Ions and Extra Electrons  [ENDORSED]

(Polar molecules, Non-polar molecules, etc.)

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Daniel Vo 1B
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Joined: Thu Jul 13, 2017 3:00 am

Ions and Extra Electrons

Postby Daniel Vo 1B » Mon Nov 13, 2017 2:18 am

When we have to find the structure and shape of an ion, where does the extra electron go? Would it have several different shapes like how Lewis dot structures have several resonance structures?

Sarah_Stay_1D
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Joined: Sat Jul 22, 2017 3:00 am
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Re: Ions and Extra Electrons  [ENDORSED]

Postby Sarah_Stay_1D » Mon Nov 13, 2017 10:21 am

Daniel Vo 1B wrote:When we have to find the structure and shape of an ion, where does the extra electron go? Would it have several different shapes like how Lewis dot structures have several resonance structures?



I would not think of it as "extra electrons". The additional electrons in an ion are part of the structure and should be drawn as such. When drawing a lewis structure of an ion, there is not always resonance. The fact that you are determining the structure of an ion should not change the way in which you go about finding what type of structure it is. Additionally, when you have lewis resonance structures this typically does not change the shape of the molecule. Resonance structures still have the same number of regions of electron density, therefore, they should still have the same shape.

Lauren Seidl 1D
Posts: 51
Joined: Fri Sep 29, 2017 7:06 am

Re: Ions and Extra Electrons

Postby Lauren Seidl 1D » Mon Nov 13, 2017 4:20 pm

It's easiest to treat ions like other molecules when determining lewis structures, by first adding up all of the valence electrons and either adding or subtracting the electrons (depending on whether it is a cation or anion) to the total number. Then just draw the structure so that the total number of electrons is present. The charge of the ion can be confirmed by finding the formal charge for each atom.


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