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VSEPR model

Posted: Thu Nov 15, 2018 11:06 am
by Roni Touboul
What is the VSEPR model?

Re: VSEPR model

Posted: Thu Nov 15, 2018 11:10 am
by Nicole Lee 4E
It's the model we use to predict shapes of molecules and polyatomic ions.

Re: VSEPR model

Posted: Thu Nov 15, 2018 11:12 am
by annabel 2A
The VSEPR model is the Valence-Shell Electron-Pair Repulsion model, which explains experimentally observed shapes of molecules.

Re: VSEPR model

Posted: Thu Nov 15, 2018 6:05 pm
by Diana Bibireata 1B
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.

Re: VSEPR model

Posted: Thu Nov 15, 2018 6:28 pm
by AustinGrove3B
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...

Re: VSEPR model

Posted: Thu Nov 15, 2018 7:12 pm
by Henri_de_Guzman_3L
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.