Trigonal planar vs. Trigonal bipyramidal

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

Moderators: Chem_Mod, Chem_Admin

MadisonFuentes1G
Posts: 52
Joined: Fri Sep 29, 2017 7:04 am

Trigonal planar vs. Trigonal bipyramidal

Postby MadisonFuentes1G » Fri Nov 03, 2017 3:42 pm

When would the VSEPR shape be trigonal planar as opposed to trigonal bipyramidal, and vice versa?

Girija_3E
Posts: 27
Joined: Fri Sep 29, 2017 7:07 am
Been upvoted: 1 time

Re: Trigonal planar vs. Trigonal bipyramidal

Postby Girija_3E » Fri Nov 03, 2017 4:37 pm

Hi,

I am not sure if this is what you're asking, but the difference between the two is:
• a trigonal planar shape has only one plane, and has only 3 bonding regions
• on the other hand, the trigonal bipyramidal shape has a plane, in addition to two electron bonding regions both above and below the plane, so it kind of looks like two pyramids facing each other. The trigonal bipyramidal shape has 5 bonding regions.

Andy Nguyen 1A
Posts: 56
Joined: Thu Jul 27, 2017 3:00 am

Re: Trigonal planar vs. Trigonal bipyramidal

Postby Andy Nguyen 1A » Fri Nov 03, 2017 4:47 pm

Hi, just to add on, molecules that have a trigonal bipyramidal shape have more regions of electron density so these bonds are as far away as possible. A trigonal planar is only on one plane while the trigonal bipyramidal adds a 3rd dimension.

Chloe Blume 1F
Posts: 15
Joined: Fri Sep 29, 2017 7:04 am

Re: Trigonal planar vs. Trigonal bipyramidal

Postby Chloe Blume 1F » Sat Nov 04, 2017 4:22 pm

Trigonal planar is when there is a central atom and 3 bonding pairs, trigonal bipyramidal is when there is a central atom and 5 bonding pairs.

Emily Oren 3C
Posts: 50
Joined: Fri Sep 29, 2017 7:07 am

Re: Trigonal planar vs. Trigonal bipyramidal

Postby Emily Oren 3C » Sat Nov 04, 2017 10:19 pm

Here's some example images to help you visualize the difference between trigonal planar and trigonal bipyramidal:
Trigonal Planar: https://upload.wikimedia.org/wikipedia/ ... -balls.png
Trigonal Bipyramidal: https://upload.wikimedia.org/wikipedia/ ... -balls.png
Both: https://s3-us-west-2.amazonaws.com/cour ... 0geos.jpeg


Return to “Determining Molecular Shape (VSEPR)”

Who is online

Users browsing this forum: No registered users and 1 guest