Molecular Shape

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

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Alyssa Wilson 2A
Posts: 65
Joined: Fri Sep 28, 2018 12:18 am

Molecular Shape

Postby Alyssa Wilson 2A » Sat Nov 24, 2018 10:54 pm

Can someone please give an overview of when you would end up with a seesaw structure?

Matthew Choi 2H
Posts: 59
Joined: Fri Sep 28, 2018 12:18 am

Re: Molecular Shape

Postby Matthew Choi 2H » Sat Nov 24, 2018 11:02 pm

Imagine a molecule with the VSEPR formula, AX4E1. There is a central atom with 4 bonds and one lone pair. The electron geometry for this molecule would be trigonal bipyramidal: one bond going straight up, one bond going straight down, and three on the equatorial plane. However, the formula AX4E1 has a lone pair which occupies one of the three bond areas along the equatorial plane. If you can imagine the rest of the structure, it will look like a seesaw with the remaining bonds occupying the rest of the bonds mentioned before.

Samantha Ito 2E
Posts: 64
Joined: Fri Sep 28, 2018 12:29 am

Re: Molecular Shape

Postby Samantha Ito 2E » Sun Nov 25, 2018 2:10 am

A seesaw structure occurs when the electron geometry is trigonal bipyramidal and there are 4 bonds to the central atom and 1 lone pair to the central atom.

Samantha Ito 2E
Posts: 64
Joined: Fri Sep 28, 2018 12:29 am

Re: Molecular Shape

Postby Samantha Ito 2E » Sun Nov 25, 2018 2:13 am

seesaw shape.jpg
Hope this helps you to visualize it!

Niveda_B_3I
Posts: 60
Joined: Fri Sep 28, 2018 12:24 am

Re: Molecular Shape

Postby Niveda_B_3I » Sun Nov 25, 2018 3:15 pm

The arrangement of the electron density would be trigonal bipyramidal, but the arrangement of the atoms would be tetrahedral, since there's a lone pair. As a result, you would end up with seesaw structure.

LedaKnowles2E
Posts: 62
Joined: Fri Sep 28, 2018 12:27 am

Re: Molecular Shape

Postby LedaKnowles2E » Sun Nov 25, 2018 3:21 pm

A seesaw structure happens whenever an atom is surrounded by four atoms and one lone electron pair, or AX4E1.

davidryan3f
Posts: 63
Joined: Fri Sep 28, 2018 12:23 am

Re: Molecular Shape

Postby davidryan3f » Sun Nov 25, 2018 4:37 pm

A molecule with a seesaw molecular geometry will have a total of 5 electron domains and one of them will be a lone pair of electrons. The molecule will have angles of 120, 180, and 90 degrees at various locations.

Andrewwiner4D
Posts: 32
Joined: Fri Sep 28, 2018 12:28 am

Re: Molecular Shape

Postby Andrewwiner4D » Sun Nov 25, 2018 4:55 pm

There are four bonded atoms and one lone pair. The angles of the bonded atoms are 90, 90>angle>180, and 180. Mostly the four bonded atoms are tetrahedral, but the lone pair pushes down the atoms.


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