Square Planar vs Tetrahedral

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

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Peter Nguyen 2I
Posts: 61
Joined: Fri Sep 28, 2018 12:29 am

Square Planar vs Tetrahedral

Postby Peter Nguyen 2I » Sun Nov 18, 2018 2:42 pm

What is the difference between square planar and tetrahedral? They both have 5 atoms but why are they different shapes?

Dayna Pham 1I
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Joined: Fri Sep 28, 2018 12:16 am
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Re: Square Planar vs Tetrahedral

Postby Dayna Pham 1I » Sun Nov 18, 2018 2:45 pm

Hello! Square planar is with regards to molecular geometry/arrangement, that is, it considers the lone pairs and how their repulsion affect the bond angle. However, tetrahedral is with regards to the shape of the molecule, only considering the atoms and not the lone pairs.

Daniel Lai
Posts: 65
Joined: Fri Sep 28, 2018 12:28 am

Re: Square Planar vs Tetrahedral

Postby Daniel Lai » Sun Nov 18, 2018 2:47 pm

Square planar has two lone pairs that cause the 4 atoms surrounding the central atom to form a square. Tetrahedral has no lone pairs .

Lasya Gudipudi 1A
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Joined: Fri Sep 28, 2018 12:15 am

Re: Square Planar vs Tetrahedral

Postby Lasya Gudipudi 1A » Sun Nov 18, 2018 2:52 pm

Also, in the example we did in class with XeF4, this is a square planar because it has 4 bonding pairs plus 2 lone pairs while a tetrahedral only has 4 bonding pairs, such as CH4. XeF4 has 6 regions of electron density while CH4 has 4 regions of electron density, which can also play a role in the molecule's shape.

Jaqueline Monreal 2L
Posts: 57
Joined: Fri Sep 28, 2018 12:28 am

Re: Square Planar vs Tetrahedral

Postby Jaqueline Monreal 2L » Sun Nov 18, 2018 3:00 pm

although they both have four bonds the square planar has 2 more areas of electron density because of the extra 2 lone pairs, therefore they have to be different shapes

305117729
Posts: 30
Joined: Fri Sep 28, 2018 12:16 am

Re: Square Planar vs Tetrahedral

Postby 305117729 » Sun Nov 18, 2018 4:00 pm

square planar has 6 electron domains and 4 of them are forming bonds, 2 lone pairs. while tetrahedral shape has 4 electron domains and all of them form bond, no lone pair

Nicole Jakiel 4F
Posts: 32
Joined: Fri Sep 28, 2018 12:28 am

Re: Square Planar vs Tetrahedral

Postby Nicole Jakiel 4F » Sun Nov 18, 2018 4:45 pm

According to the lecture notes:
Tetrahedral: the central atom has 4 bonding pairs
Square Planar: the central atom has 4 bonding pairs and 2 lone pairs

Karina Jiayu Xu 4E
Posts: 58
Joined: Fri Sep 28, 2018 12:29 am

Re: Square Planar vs Tetrahedral

Postby Karina Jiayu Xu 4E » Sun Nov 18, 2018 4:54 pm

So does square planar molecules have AX4E2 and tetrahedral just Ax4?

Jordan Y4D
Posts: 25
Joined: Fri Sep 28, 2018 12:27 am

Re: Square Planar vs Tetrahedral

Postby Jordan Y4D » Sun Nov 18, 2018 4:58 pm

The difference is based on the actual lewis dot structure. Square Planar is AX4E2, whereas tetrahedral is simply AX4. This is a significant difference.


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