VSEPR model

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Roni Touboul
Posts: 31
Joined: Fri Sep 28, 2018 12:24 am

VSEPR model

Postby Roni Touboul » Thu Nov 15, 2018 11:06 am

What is the VSEPR model?

Nicole Lee 4E
Posts: 60
Joined: Fri Sep 28, 2018 12:16 am
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Re: VSEPR model

Postby Nicole Lee 4E » Thu Nov 15, 2018 11:10 am

It's the model we use to predict shapes of molecules and polyatomic ions.

annabel 2A
Posts: 67
Joined: Fri Sep 28, 2018 12:18 am

Re: VSEPR model

Postby annabel 2A » Thu Nov 15, 2018 11:12 am

The VSEPR model is the Valence-Shell Electron-Pair Repulsion model, which explains experimentally observed shapes of molecules.

Diana Bibireata 1B
Posts: 60
Joined: Fri Sep 28, 2018 12:23 am

Re: VSEPR model

Postby Diana Bibireata 1B » Thu Nov 15, 2018 6:05 pm

The VSEPR model accounts for bond angles and molecular shape. Regions of high electron concentration in a molecule repel one another so these regions move as far as possible to minimize repulsions.

AustinGrove3B
Posts: 53
Joined: Fri Sep 28, 2018 12:23 am

Re: VSEPR model

Postby AustinGrove3B » Thu Nov 15, 2018 6:28 pm

In other words, it is a model that explains how/why the molecules have the shape that they do. If you don't like the phrase VSEPR model, you could just think "molecular shape" instead. It is all the stuff we have done in class the last 2 days regarding trigonal planar, tetrahedral, octahedral etc...

Henri_de_Guzman_3L
Posts: 88
Joined: Fri Sep 28, 2018 12:25 am

Re: VSEPR model

Postby Henri_de_Guzman_3L » Thu Nov 15, 2018 7:12 pm

To me the model is very intuitive but the definition can be overwhelming. Basically VSEPR models follow the basic formula of AXE with a number subscript on the X and E. We regard A as the central atom. X is the number of bonds of with other atoms (VSEPR doesn't care if they're single, double, or triple) and E is the number of lone pair electrons.

As a simple example consider Nitrogen Dioxide which after drawing the Lewis structure, we see that the central Nitrogen atom makes a bond with 2 oxygen atoms and has a single lone pair of electrons. We would thus write AX2E

Using VSEPR models help us then determine the structure of molecules.


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