Lone Pairs

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905092269
Posts: 32
Joined: Fri Sep 28, 2018 12:29 am

Lone Pairs

Postby 905092269 » Sun Nov 25, 2018 8:39 pm

Can someone explain why lone pairs are more likely to found in certain locations around a central atom and
how and why they affect the bond angles in a molecule, cation, or anion?

Vana Mirzakhani 3I
Posts: 62
Joined: Fri Sep 28, 2018 12:24 am

Re: Lone Pairs

Postby Vana Mirzakhani 3I » Sun Nov 25, 2018 8:45 pm

Lone pairs have great repulsion strength from one another, always trying to move as far apart as possible while keeping an equally distributed distance from the central atom.

hanna_maillard3B
Posts: 61
Joined: Fri Sep 28, 2018 12:23 am

Re: Lone Pairs

Postby hanna_maillard3B » Sun Nov 25, 2018 9:41 pm

lone pairs on a central atom has exceptional repulsion strength so they try to repel all nearby bonds/electrons which is why some molecules with a lone pair on the central atom that should have a certain bond angle, have slightly different ones; the lone pair pushes the bonded pairs closer to one another. So, a tetrahedral for example, should have a 109.5* bond, but if there is a lone pair on the central atom which counts as one of the regions of electron density, then the bond will be slightly less than 109.5*.

Arlene Linares 3A
Posts: 50
Joined: Fri Sep 28, 2018 12:25 am

Re: Lone Pairs

Postby Arlene Linares 3A » Tue Nov 27, 2018 11:56 pm

Vana Mirzakhani 3G wrote:Lone pairs have great repulsion strength from one another, always trying to move as far apart as possible while keeping an equally distributed distance from the central atom.




Thank you

Kavya Juwadi 3C
Posts: 30
Joined: Fri Sep 28, 2018 12:25 am

Re: Lone Pairs

Postby Kavya Juwadi 3C » Sun Dec 02, 2018 12:09 am

One example of a specific lone pair placement would be that in a molecule with square pyramidal geometry, the lone pair would be on the axial plane rather than the equatorial plane.

Sreyes_1G
Posts: 44
Joined: Fri Sep 28, 2018 12:19 am

Re: Lone Pairs

Postby Sreyes_1G » Sun Nov 17, 2019 9:41 pm

A lone pair of electrons at a central atom always tries to repel bonded pair of electrons. So, the bonds are displaced slightly, which leads to a decrease of bond angle.


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