Rule 3 of the VSPER model

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

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TiffanyL1G
Posts: 61
Joined: Fri Sep 28, 2018 12:22 am

Rule 3 of the VSPER model

Postby TiffanyL1G » Tue Nov 13, 2018 2:51 pm

Can someone describe in simpler terms what rule 3 is talking about?

The textbook says, "All regions of high electron density, lone pairs, and bonds, are included in a description of the electronic arrangement, but only the positions of atoms are considered when identifying the shape of a molecule."

I am confused on why the shape of the ion describes the location of the ions but not the lone pairs.

Elena Saab 4A
Posts: 43
Joined: Fri Sep 28, 2018 12:27 am

Re: Rule 3 of the VSPER model

Postby Elena Saab 4A » Tue Nov 13, 2018 3:08 pm

The lone pairs on the central atom determine the angles between the surrounding atoms. So technically, you do need to consider the position of the lone pairs, even though the shape is determined by the atoms.


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