Molecular Shapes

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

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Shreya Tamatam 3B
Posts: 30
Joined: Fri Sep 28, 2018 12:25 am

Molecular Shapes

Postby Shreya Tamatam 3B » Thu Nov 15, 2018 10:53 pm

How can you tell whether a molecule has a tetrahedral structure instead of a see saw structure? Does the number of lone pairs the central atom has have any effect on the molecule's shape?

Jeffrey Xiao 4A
Posts: 35
Joined: Fri Sep 28, 2018 12:28 am
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Re: Molecular Shapes

Postby Jeffrey Xiao 4A » Thu Nov 15, 2018 10:57 pm

Tetrahedral structure is where the central atom has just 4 bonded atoms while seesaw shape is where the central atom has 4 bonded atoms and one lone pair.

Nada AbouHaiba 1I
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Joined: Fri Sep 28, 2018 12:28 am
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Re: Molecular Shapes

Postby Nada AbouHaiba 1I » Thu Nov 15, 2018 11:39 pm

I think this is a good tool for classifying molecular shapes
Attachments
Chem.png

Kailey Nichols 4B
Posts: 30
Joined: Fri Sep 28, 2018 12:28 am

Re: Molecular Shapes

Postby Kailey Nichols 4B » Thu Nov 15, 2018 11:39 pm

Also, if you think about it, because of lone pair-bonding repulsion compared to bonding-bonding repulsion and the total number of "things" around the central atom, the one lone pair of electrons will cause major VSEPR shape differences in the molecule (in the seesaw shape, the lone pair pushes down on the closest two bonded atoms creating at least a 180 degree angle between those two closest atoms whereas in the tetrahedral all the bonded atoms push away from one another pretty much equally which is why each atom is about 109.5 degrees away from the next)


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