VSEPR theory

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Dahriel Aron 3A
Posts: 60
Joined: Fri Sep 25, 2015 3:00 am

VSEPR theory

Postby Dahriel Aron 3A » Tue Oct 20, 2015 10:14 am

I was wondering if someone could explain to me how to tell the difference between when a molecule will be AX3, AX4,AX3E,AX2E,AX2,and AX2E2. For example, how do you know that CH2 would be AX2E, but CH2(2+) would just be AX2?

Emily Huang 2A
Posts: 32
Joined: Fri Sep 25, 2015 3:00 am

Re: VSEPR theory

Postby Emily Huang 2A » Tue Oct 20, 2015 12:23 pm

With VSEPR formulas, the X represents number of bonded atoms, and the E represents the number of lone pairs. To determine the VSEPR formula, you can draw the Lewis structure and count the number of bonded atoms and lone pairs on the central atom. If the central atom of the molecule has a lone pair and two bonded atoms, it will be AX2E. But if the central atom has only two bonded atoms and no lone pairs, it will be AX2. Same goes for AX3E, AX3, etc.

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