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Distance from Central Atom

Posted: Fri Nov 16, 2018 10:29 am
by Annalyn Diaz 1J
So I understand that in drawing VSEPR diagrams (or even just a 2D representation with Lewis structures) we use the wedges to represent distance from the central atom. For my question, I was confused on which type of wedge indicated a further distance: the completely shaded or the hatched wedges?

Re: Distance from Central Atom

Posted: Fri Nov 16, 2018 11:09 am
by Raymond Ko 1H
If you imagine a methane molecule (CH4) molecule drawn on the white board with the shaded and hatched triangles showing the VSEPR shape, the shaded triangle shows a Hydrogen atom that is coming out from the white board toward you. The hatched triangle shows a Hydrogen atom protruding behind the white board away from you.

Re: Distance from Central Atom

Posted: Fri Nov 16, 2018 11:21 am
by Stephen Sirmay 1I
The shaded triangle and the hatched triangle are opposites. Shaded illustrates a bond that is in front of the central atom, while hatched illustrates a bond behind the central atom.

Re: Distance from Central Atom

Posted: Fri Nov 16, 2018 12:50 pm
by Irene Zhou 1E
The shaded and hatched wedges are just there to help distinguish that the bonds are existing in three dimensions. A shaded wedge indicates that the bond is coming out of the plane while a hatched wedge indicates that the wedge is extending back into the plane.

Re: Distance from Central Atom

Posted: Fri Nov 16, 2018 1:04 pm
by Celine Hoh 2L
Then does a non-wedge bond indicate that the bond goes sideways?

Re: Distance from Central Atom

Posted: Fri Nov 16, 2018 1:46 pm
by Nikki Bych 1I
I always think of it as shaded represents an atom coming out of the page and dashed represents an atom going backwards, into the page.

Re: Distance from Central Atom

Posted: Fri Nov 16, 2018 2:31 pm
by Hannah Yates 1K
The completely dark wedge represents the atom coming towards you, and the dashed wedge represents the atom going away. I’m not quite sure why, but I also don’t think it matters that much as long as you know that they are on a diferent plane.

Re: Distance from Central Atom

Posted: Fri Nov 16, 2018 6:30 pm
by Kelly Hollman
The direct wedge is coming out of the page and the hatched wedge is going into the page!

Re: Distance from Central Atom

Posted: Sat Nov 17, 2018 10:28 am
by KHuang1L
The completely shaded wedges represent atoms that are coming out of the page, while the hatched wedges represent atoms that are going into the page.