Lone pairs

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

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Alysia Garcia 1B
Posts: 40
Joined: Wed Feb 21, 2018 3:02 am

Lone pairs

Postby Alysia Garcia 1B » Sun Jun 03, 2018 4:51 pm

I know that an atom with a lone pair would cause more repulsion and therefore a smaller bond angle than normal but how does it cause this repulsion?

Shione Nakahara 1F
Posts: 31
Joined: Fri Apr 06, 2018 11:04 am

Re: Lone pairs

Postby Shione Nakahara 1F » Sun Jun 03, 2018 5:15 pm

Bonding pairs take up less space because they are farther away from the central atom and is controlled by the sharing atoms, while a lone pair is closer to the nucleus and repels more strongly.

Jimmy lira-1G
Posts: 61
Joined: Fri Apr 06, 2018 11:03 am

Re: Lone pairs

Postby Jimmy lira-1G » Sun Jun 03, 2018 8:19 pm

To answer your question:

"Lone pairs have the greatest repelling effect because they are closer to the nucleus of the central atom compared to the bonding pairs, therefore they repel other lone pairs greater compared to bonding pairs. Bonding pairs have a bond between the nucleus of the central atom and the nucleus of a bonding atom, therefore, are further away from the nucleus, so they do not repel other electrons as much as lone pairs. "
I posted an attachment to another post but ill post it here to where that ^ information comes from!

-Jimmy Lira 1G
Attachments
I6-VSEPR-Effectoflonepairstheorysheet_000(1).pdf
(605.28 KiB) Downloaded 6 times

Alexis Bravo 1D
Posts: 30
Joined: Tue Nov 14, 2017 3:01 am

Re: Lone pairs

Postby Alexis Bravo 1D » Sun Jun 03, 2018 9:31 pm

The lone pair would cause the repulsion because of how close it is to the nucleus of the central atom.

Jonghwee Park 1K
Posts: 30
Joined: Fri Apr 06, 2018 11:04 am

Re: Lone pairs

Postby Jonghwee Park 1K » Sun Jun 03, 2018 9:36 pm

Would the increasing number of lone pairs on one atom increasingly decrease the bond angles of the molecule?

Yitzchak Jacobson 1F
Posts: 31
Joined: Wed Nov 22, 2017 3:00 am

Re: Lone pairs

Postby Yitzchak Jacobson 1F » Sun Jun 03, 2018 9:50 pm

Hello :)
I believe the lone pair would cause the repulsion due to the distance it is from the central atom.
Really hope this helps!

JulietOttenberg-1C
Posts: 25
Joined: Fri Apr 06, 2018 11:04 am

Re: Lone pairs

Postby JulietOttenberg-1C » Sun Jun 03, 2018 9:51 pm

depending on where they are positioned, they could decrease the bond angles of the atom. If there are multiple lone pairs, they usually repel each other even more than bonding pairs so it really just depends on the structure.

Isobel Tweedt 1E
Posts: 31
Joined: Fri Apr 06, 2018 11:05 am

Re: Lone pairs

Postby Isobel Tweedt 1E » Sun Jun 03, 2018 10:16 pm

In the case of linear shapes when a trigonal bipyramidal has 3 loan pairs or an octahedral has 4 loan pairs the bond angles are determined to be 180 degrees. How do loan pairs cause this?


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