Remembering VSEPR

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

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Manya Kidambi 3I
Posts: 31
Joined: Fri Sep 28, 2018 12:24 am

Remembering VSEPR

Postby Manya Kidambi 3I » Sat Nov 10, 2018 5:05 pm

What’s the easiest way to remember the VSEPR shapes?

Elias Omar 1G
Posts: 52
Joined: Fri Sep 28, 2018 12:17 am

Re: Remembering VSEPR

Postby Elias Omar 1G » Sat Nov 10, 2018 5:32 pm

The most important thing to remember is that the electrons are repelling each other and wan to be as far from each other as three dimensions will allow them to be. So whatever number of atoms you have just arrange them so that they are the largest angle apart from each other as possible.

As for the shapes themselves, without lone pair electrons the shapes are:
Linear-180 degrees
Trigonal Planar-120 degrees
Tetrahedral-109 degrees
Trigonal Bipyramidal-120 and 90 degrees
Octahedral-90 degrees

A good neuomonic I found was Large Turtle Play Tennis To Break Oranges for the shapes.

Dong Hyun Lee 4E
Posts: 68
Joined: Fri Sep 28, 2018 12:23 am

Re: Remembering VSEPR

Postby Dong Hyun Lee 4E » Sat Nov 10, 2018 5:42 pm

Elias Omar 1G wrote:The most important thing to remember is that the electrons are repelling each other and wan to be as far from each other as three dimensions will allow them to be. So whatever number of atoms you have just arrange them so that they are the largest angle apart from each other as possible.

As for the shapes themselves, without lone pair electrons the shapes are:
Linear-180 degrees
Trigonal Planar-120 degrees
Tetrahedral-109 degrees
Trigonal Bipyramidal-120 and 90 degrees
Octahedral-90 degrees

A good neuomonic I found was Large Turtle Play Tennis To Break Oranges for the shapes.


How would you find the angles of these shaped molecules when in the presence of loine pairs. I know lone pairs would change the angles as the atoms would want to maximize the area between them due to repulsion.


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