## Angle Distortion

Moderators: Chem_Mod, Chem_Admin

Anokhi Patel 2B
Posts: 76
Joined: Fri Aug 09, 2019 12:17 am

### Angle Distortion

How do we know when a VSEPR model has a distortion like 106 degrees instead of the traditional 109.5 degrees for tetrahedral bonds.

Trinity Vu 1D
Posts: 53
Joined: Fri Aug 30, 2019 12:15 am

### Re: Angle Distortion

The tetrahedral bond angles become distorted when the central atom has lone pair(s) of electrons. Since the repulsion strength between a lone [air and bonding pair of electrons is greater than bonding-bonding pairs, the lone pair of electrons force the bonding electrons closer together. Thus the bond angles become smaller.

Sydney Jacobs 1C
Posts: 59
Joined: Thu Jul 25, 2019 12:15 am
Been upvoted: 1 time

### Re: Angle Distortion

For example, in the case of a trigonal pyramidal shape, in which there are 3 bonding pairs and one lone pair, the lone pair- bonding pair repulsion is stronger than a bonding pair- bonding pair repulsion. This condenses the angle to less than 109.5. The tetrahedral shape lacks this lone pair-bonding pair repulsion, allowing the angle to be 109.5.

205154661_Dis2J
Posts: 109
Joined: Wed Sep 18, 2019 12:21 am

### Re: Angle Distortion

We can tell when a VSEPR model has distortion because usually the central atom will have a lone pair or more. When the central atom has a lone pair, it pushes the bond electrons closer to one another, thereby making the bond angle smaller.

JasonKwon_3k
Posts: 51
Joined: Thu Jul 11, 2019 12:16 am

### Re: Angle Distortion

To answer by which factor the distortion affects the bond angles, you can remember the order in which they vary in strength (with lone pair-lone pair being the greatest and atom-atom) being the least.

Return to “Bond Lengths & Energies”

### Who is online

Users browsing this forum: No registered users and 1 guest