Distance from Central Atom

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

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Annalyn Diaz 1J
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Joined: Fri Sep 28, 2018 12:15 am

Distance from Central Atom

Postby Annalyn Diaz 1J » Fri Nov 16, 2018 10:29 am

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?

Raymond Ko 1H
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Re: Distance from Central Atom

Postby Raymond Ko 1H » Fri Nov 16, 2018 11:09 am

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.

Stephen Sirmay 1I
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Re: Distance from Central Atom

Postby Stephen Sirmay 1I » Fri Nov 16, 2018 11:21 am

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.

Irene Zhou 1E
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Joined: Fri Sep 28, 2018 12:18 am

Re: Distance from Central Atom

Postby Irene Zhou 1E » Fri Nov 16, 2018 12:50 pm

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.

Celine Hoh 2L
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Re: Distance from Central Atom

Postby Celine Hoh 2L » Fri Nov 16, 2018 1:04 pm

Then does a non-wedge bond indicate that the bond goes sideways?

Nikki Bych 1I
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Re: Distance from Central Atom

Postby Nikki Bych 1I » Fri Nov 16, 2018 1:46 pm

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.

Hannah Yates 1K
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Re: Distance from Central Atom

Postby Hannah Yates 1K » Fri Nov 16, 2018 2:31 pm

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.

Kelly Hollman
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Re: Distance from Central Atom

Postby Kelly Hollman » Fri Nov 16, 2018 6:30 pm

The direct wedge is coming out of the page and the hatched wedge is going into the page!

KHuang1L
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Re: Distance from Central Atom

Postby KHuang1L » Sat Nov 17, 2018 10:28 am

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.


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