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Ions and Extra Electrons

Posted: Mon Nov 13, 2017 2:18 am
by Daniel Vo 1B
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?

Re: Ions and Extra Electrons  [ENDORSED]

Posted: Mon Nov 13, 2017 10:21 am
by Sarah_Stay_1D
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.

Re: Ions and Extra Electrons

Posted: Mon Nov 13, 2017 4:20 pm
by Lauren Seidl 1D
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.