Inter-molecular Electron Repulsion

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

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Suraj Doshi 2G
Posts: 100
Joined: Fri Aug 02, 2019 12:15 am

Inter-molecular Electron Repulsion

Postby Suraj Doshi 2G » Fri Nov 15, 2019 11:25 am

When discussing repulsion strength between regions of electron density and atoms, how can we determine which repulsion forces (ie lone-lone PR, lone-bonding PR, bonding-bonding PR) are the strongest?

Luyan Zhang - 2D
Posts: 103
Joined: Sat Jul 20, 2019 12:16 am

Re: Inter-molecular Electron Repulsion

Postby Luyan Zhang - 2D » Fri Nov 15, 2019 11:31 am

Lone pair-lone pair > Lone pair-bonding pair > bonding pair-bonding pair

I think you will just have to remember this.

Gwen Casillan 3E
Posts: 46
Joined: Sat Sep 07, 2019 12:17 am

Re: Inter-molecular Electron Repulsion

Postby Gwen Casillan 3E » Fri Nov 15, 2019 11:33 am

The repulsion forces in order of least to most strong are:
bonding-bonding pr < lone-bonding pr < lone-lone pr

Justin Quan 4I
Posts: 104
Joined: Sat Sep 14, 2019 12:17 am

Re: Inter-molecular Electron Repulsion

Postby Justin Quan 4I » Fri Nov 15, 2019 1:11 pm

Lone pair-lone pair > Lone pair-bonding pair > bonding pair-bonding pair

Lone pair-lone pair have the most repulsion force because of the shape of the electron density. The lone pair e- are more closer together, so they have stronger forces.

Shivam Rana 1D
Posts: 106
Joined: Fri Aug 09, 2019 12:16 am

Re: Inter-molecular Electron Repulsion

Postby Shivam Rana 1D » Fri Nov 15, 2019 1:13 pm

You can also think of strength by how diffuse each type of pair is. Therefore, because the lone pair is the most diffuse, it is the most repulsive. Lone pairs also have lower effective nuclear charge acting on them.

RRahimtoola1I
Posts: 102
Joined: Fri Aug 09, 2019 12:15 am

Re: Inter-molecular Electron Repulsion

Postby RRahimtoola1I » Sat Nov 16, 2019 2:43 pm

What is an example of a lone-bonding pair?

EthanPham_1G
Posts: 104
Joined: Sat Jul 20, 2019 12:17 am

Re: Inter-molecular Electron Repulsion

Postby EthanPham_1G » Sat Nov 16, 2019 4:26 pm

An example of a lone pair-bonding pair repulsion would be sulfur tetrafluoride, SF4. It has 5 areas of electron density: 4 bonding pairs and 1 lone pair. The lone pair on the central sulfur atom repels the four bonding pairs and reduces the bond angle.


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