VSEPR model

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

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Sara Richmond 2K
Posts: 110
Joined: Fri Aug 30, 2019 12:16 am

VSEPR model

Postby Sara Richmond 2K » Tue Nov 12, 2019 5:44 pm

What does VSEPR stand for? How do we determine a molecules VSEPR formula for a molecule.

Jade Hinds 2B
Posts: 75
Joined: Tue Sep 10, 2019 12:16 am

Re: VSEPR model

Postby Jade Hinds 2B » Tue Nov 12, 2019 7:34 pm

VSEPR= valence shell electron pair repulsion theory

*p.s. not quite sure on how to determine formula yet

Matthew Tsai 2H
Posts: 101
Joined: Wed Sep 18, 2019 12:20 am

Re: VSEPR model

Postby Matthew Tsai 2H » Tue Nov 12, 2019 9:13 pm

VSEPR stands for Valence Shell Electron Pair Repulsion, and VSEPR theory refers to the concept that molecular shape can be determined (at least for smaller molecules) based on the number of bonded atoms and lone pairs due to their tendency to maximize distance from each other. The AXE formula just identifies A=central atom, X=number of bonded atoms, E=number of lone pairs.

Brooke Yasuda 2J
Posts: 102
Joined: Sat Jul 20, 2019 12:17 am

Re: VSEPR model

Postby Brooke Yasuda 2J » Tue Nov 12, 2019 9:45 pm

VSEPR is a rule that describes how atoms in a molecule are likely to move as far away from each other as possible to reduce repulsions. Therefore, when you are drawing your geometric shape of a molecule, count how many bonds there are and you have to memorize how the number of lone pairs on the molecule affects the shape and its name.

Sean Sugai 4E
Posts: 56
Joined: Wed Sep 11, 2019 12:17 am

Re: VSEPR model

Postby Sean Sugai 4E » Wed Nov 13, 2019 1:14 am

VSEPR stands for Valence-Shell Electron-Pair Repulsion, and it extends Lewis's theory by adding rules that explain bond angles and molecular shapes brought on by lone pairs. According to this model, regions of high electron density repel one another and these regions move to the most distant locations to minimize these repulsions; multiple bonds are treated as a single unit; and the shape of the molecule is identified based on the relative locations of its atoms with respect to the electron repulsions and farthest location. To determine a molecule's VSEPR formula, use the generic formula: AXnEm, where A represents the central atom, X represents atoms attached to the central atom, and E represents a lone pair. Molecules that follow the same VSEPR formula have the same electron arrangement and the same shape, so recognizing these patterns will help predict the molecule's shape.


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