Long pairs

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

Moderators: Chem_Mod, Chem_Admin

Amina Durrani 3G
Posts: 52
Joined: Sat Jul 20, 2019 12:16 am

Long pairs

Postby Amina Durrani 3G » Sat Nov 16, 2019 12:58 pm

Why do molecules with lone pairs will have angles slightly less than what their shape would be without lone pairs?

Ethan Lam 4A
Posts: 69
Joined: Thu Jul 11, 2019 12:17 am

Re: Long pairs

Postby Ethan Lam 4A » Sat Nov 16, 2019 1:03 pm

Molecules with lone pairs have smaller bond angles because of the electron repulsion from the lone pairs that pushes other atoms away.

Angus Wu_4G
Posts: 102
Joined: Fri Aug 02, 2019 12:15 am

Re: Long pairs

Postby Angus Wu_4G » Sat Nov 16, 2019 1:04 pm

This is because when there is a lone pair, the lone pair occupies a larger space and causes electron-electron repulsion, forcing all the other regions of electron density closer to each other and farther away from the lone pair. This is why the bond angle in molecules with a lone pair is slightly less than without a lone pair.

Tiffany Chao 2H
Posts: 117
Joined: Fri Aug 09, 2019 12:17 am

Re: Long pairs

Postby Tiffany Chao 2H » Sat Nov 16, 2019 6:20 pm

Lone pairs create a strong electron-electron repulsion which pushes all other atoms closer to together. For example, if you had a trigonal pyramidal with a lone pair at the top, it would push the atoms that are part of the structure closer together, creating a smaller bond angle between the atoms.

Return to “Determining Molecular Shape (VSEPR)”

Who is online

Users browsing this forum: No registered users and 3 guests