Why do lone pair electrons repel each other more strongly ?

  • Thread starter annatar
  • Start date
  • #1
24
0

Main Question or Discussion Point

In VSEPR theory, lone pairs repel each other more strongly than bonding pairs do, therefore they bend the molecule and determine its geometry.

But why does that happen? What makes the repulsion stronger?

Thanks for your help
 

Answers and Replies

  • #2
106
1
In VSEPR theory, lone pairs repel each other more strongly than bonding pairs do, therefore they bend the molecule and determine its geometry.

But why does that happen? What makes the repulsion stronger?

Thanks for your help
Because a bonding electron pair is involved in a sigma bond with another atom. Hence is at a greater distance from the nucleus of the central atom than a non bonding pair. I think you can find explained in those lectures all basic concepts of chemistry

http://ocw.mit.edu/OcwWeb/Chemistry/5-112Fall-2005/VideoLectures/index.htm
 
  • #3
DrDu
Science Advisor
6,032
759
There are two points of importance, here:
1. The repulsion between electrons on different atoms is much smaller than between electrons on the same atom.
2. In a truely covalent bond, there is only one electron of the two per bond (at least on the mean) at a given atom as compared to two in a lone pair.

This is most clear in the limit, where the atoms are very far apart.
 

Related Threads on Why do lone pair electrons repel each other more strongly ?

Replies
1
Views
5K
  • Last Post
Replies
15
Views
21K
Replies
2
Views
3K
Replies
2
Views
5K
Replies
0
Views
3K
Replies
6
Views
1K
  • Last Post
Replies
8
Views
15K
  • Last Post
Replies
18
Views
6K
Replies
5
Views
3K
  • Last Post
Replies
17
Views
27K
Top