Lone pairs

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

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Dina Geotas 4A
Posts: 61
Joined: Fri Sep 28, 2018 12:29 am

Lone pairs

Postby Dina Geotas 4A » Sun Nov 18, 2018 9:39 pm

I know that lone pairs influence the shape of the molecule, but do they also influence the name of the shape?

Raphael_SanAndres3C
Posts: 33
Joined: Fri Sep 28, 2018 12:24 am

Re: Lone pairs

Postby Raphael_SanAndres3C » Sun Nov 18, 2018 9:41 pm

Yes. A lone pair adds one more electron cloud to the shape which changes the shape (and in turn the name) as well as the bond angles.

Mona Lee 4L
Posts: 60
Joined: Fri Sep 28, 2018 12:16 am

Re: Lone pairs

Postby Mona Lee 4L » Sun Nov 18, 2018 9:41 pm

Yes. Although both the tetrahedral and see-saw shape have four atoms bonded to the central molecule, the lone pair in the see-saw shape causes the difference in name. Every VSEPR structure (AX4 vs. AX4E1) has a different shape name.

harshitasarambale4I
Posts: 58
Joined: Fri Sep 28, 2018 12:26 am

Re: Lone pairs

Postby harshitasarambale4I » Sun Nov 18, 2018 9:44 pm

When determining the molecular shape, we consider the influence of the lone pairs on the shape, but when naming we only look at the positions of atoms. For example, in NF3, the atoms and lone pair would form a tetrahedral shape. But since we don't consider the lone pair on the N while naming, the shape is actually trigonal pyramidal.

Yvonne Du
Posts: 64
Joined: Fri Sep 28, 2018 12:23 am

Re: Lone pairs

Postby Yvonne Du » Sun Nov 18, 2018 10:05 pm

Yes, the lone pairs also affect the bond angles, and different type of VSEPR models have different bond angles.

Rhea Churi 4K
Posts: 62
Joined: Fri Sep 28, 2018 12:28 am

Re: Lone pairs

Postby Rhea Churi 4K » Sun Nov 18, 2018 10:08 pm

Yes, lone pairs change the shape by changing bond angles so the name changes as well.


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