Lewis structure

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Ziyan Wang 3J
Posts: 51
Joined: Wed Sep 18, 2019 12:22 am

Lewis structure

Postby Ziyan Wang 3J » Thu Oct 31, 2019 1:31 pm

I don't quite get when we draw the Lewis structure, how do we know which atom is in the middle.

Serena Siddiq 3D
Posts: 51
Joined: Fri Aug 30, 2019 12:17 am

Re: Lewis structure

Postby Serena Siddiq 3D » Thu Oct 31, 2019 1:36 pm

The easiest way to figure out which one goes in the middle is the one that has the LOWEST ionization energy, so which ever atom is higher up and more to the left than the other. It is also easy if there is a molecule like PBr5 to know which one will be in the middle, which is P because there is only one of them and the Br would surround it because that makes the molecule the most symmetrical. Hope that helps!

Tiffany Chao 2H
Posts: 117
Joined: Fri Aug 09, 2019 12:17 am

Re: Lewis structure

Postby Tiffany Chao 2H » Thu Oct 31, 2019 4:06 pm

The atom that goes in the middle is the one with the lowest ionization energy. You can figure that out using the periodic table trends for ionization energy. The further right you go in a row, the higher the ionization energy is. The further down you go in a column, the lower the ionization energy. One thing to note is that carbon ALWAYS goes in the middle.

PGao_1B
Posts: 50
Joined: Sat Jul 20, 2019 12:15 am

Re: Lewis structure

Postby PGao_1B » Thu Oct 31, 2019 5:37 pm

When we draw the Lewis structure, we know which atom is in the middle in that usually the central atom will be the one that has the most unpaired valence electrons - usually it is also the least electronegative.


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