Trigonal Bipyramidal

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

Moderators: Chem_Mod, Chem_Admin

chrisdinkel_4E
Posts: 33
Joined: Fri Sep 28, 2018 12:17 am

Trigonal Bipyramidal

Postby chrisdinkel_4E » Thu Nov 29, 2018 9:19 pm

When replacing an atom with a lone pair (molecule with 3 bonds and 2 electron pairs), why do you take away from the equatorial atoms and not the axial atoms?

spark99
Posts: 30
Joined: Fri Sep 28, 2018 12:18 am
Been upvoted: 1 time

Re: Trigonal Bipyramidal

Postby spark99 » Thu Nov 29, 2018 9:28 pm

Due to the high repulsive energy that lone pairs have, you have to think of the best possible place to put it so that the molecule is the most stable. Thus, when placing lone pairs, putting it in the equitorial position provides the most stability.

Eunice Lee 1A
Posts: 60
Joined: Wed Oct 03, 2018 12:16 am

Re: Trigonal Bipyramidal

Postby Eunice Lee 1A » Fri Nov 30, 2018 9:14 am

The axial bonds have a 90-degree bond angle with the equatorial bonds, while the equatorial bonds have a 120-degree bond angle with each other. Since the bond angles of the equatorial bonds are greater than those of the axial bonds, these atoms are replaced with the lone pairs because it gives the lone pair more space.

Ethan Breaux 2F
Posts: 63
Joined: Sat Sep 29, 2018 12:16 am

Re: Trigonal Bipyramidal

Postby Ethan Breaux 2F » Sun Dec 02, 2018 10:25 pm

Maybe I'm just reading this wrong but are you referring to see saw?

Ricardo Martin 1J
Posts: 63
Joined: Fri Sep 28, 2018 12:15 am

Re: Trigonal Bipyramidal

Postby Ricardo Martin 1J » Thu Dec 06, 2018 10:24 am

Ethan Breaux 1J wrote:Maybe I'm just reading this wrong but are you referring to see saw?

I don't think it's see saw, I think it is T-shape because I believe the structure being described has 3 bonds and 2 lone pairs, but maybe I also read it wrong.

Cameron_Greenberg_3C
Posts: 60
Joined: Fri Sep 28, 2018 12:26 am

Re: Trigonal Bipyramidal

Postby Cameron_Greenberg_3C » Fri Dec 07, 2018 2:37 pm

Ricardo Martin 1G wrote:
Ethan Breaux 1J wrote:Maybe I'm just reading this wrong but are you referring to see saw?

I don't think it's see saw, I think it is T-shape because I believe the structure being described has 3 bonds and 2 lone pairs, but maybe I also read it wrong.


Yes, trigonal bipyramidal has five bonds and no lone pairs, while T-shape has the VSEPR AX3E2. So the molecule in question has a T-shape formation.

Rosha Mamita 2H
Posts: 63
Joined: Fri Sep 28, 2018 12:19 am

Re: Trigonal Bipyramidal

Postby Rosha Mamita 2H » Fri Dec 07, 2018 6:10 pm

Ethan Breaux 1J wrote:Maybe I'm just reading this wrong but are you referring to see saw?


See saw refers to a molecule with formula AX4E (4 bonds and one lone pair) while T shaped refers to a molecule with formula AX3E2 (3 bonds and two lone pairs)


Return to “Determining Molecular Shape (VSEPR)”

Who is online

Users browsing this forum: No registered users and 2 guests