AXE

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Melissa Villanueva1K
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Joined: Wed Nov 15, 2017 3:01 am

AXE

Postby Melissa Villanueva1K » Sat Nov 17, 2018 8:56 pm

Is there a method to figure out a molecule's AXE or do we just have to memorize them in accordance to the shape? Thanks!

Porus_Karwa_2E
Posts: 72
Joined: Fri Sep 28, 2018 12:24 am

Re: AXE

Postby Porus_Karwa_2E » Sat Nov 17, 2018 9:14 pm

Well X is the number of possible bonds and E is the number of lone pairs. So you'd have to memorize this combination for each shape.

Jaifreen_Bhangu_3K
Posts: 34
Joined: Fri Sep 28, 2018 12:26 am

Re: AXE

Postby Jaifreen_Bhangu_3K » Sat Nov 17, 2018 9:28 pm

You just have to memorize it.

Dimitri Speron 1C
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Re: AXE

Postby Dimitri Speron 1C » Sun Nov 18, 2018 12:16 pm

If you memorize which molecules are the ones without lone pairs, then it is fairly easy to intuit which molecules are the ones with one less atom and a lone pair instead. (identical electron arrangement, different molecular shape) This is the method that I usually use.

Kelly Zhang 1L
Posts: 31
Joined: Fri Sep 28, 2018 12:18 am

Re: AXE

Postby Kelly Zhang 1L » Mon Nov 19, 2018 2:25 pm

Can you always determine the molecular shape of a molecule just from the VSEPR notation?

Chem_Mod
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Re: AXE

Postby Chem_Mod » Mon Nov 19, 2018 3:30 pm

You can determine the VSEPR formula (AXE) by looking at a molecule. For example, water is sp3 hybridized with AX2E2. This is because there are 2 bonded pairs (between each H and the O) and 2 lone pairs (on the oxygen). If you know an example of a molecule for each molecular geometry or are trying to determine AXE for a molecule, I would suggest drawing the LDMS and counting bonded pairs and lone pairs. If you are determining AXE for a molecule you can do that just by drawing the LDMS.

Aleeque Marselian 1A
Posts: 60
Joined: Fri Sep 28, 2018 12:24 am

Re: AXE

Postby Aleeque Marselian 1A » Mon Nov 19, 2018 5:00 pm

A is the central atom, X is the number of bonded pairs, ad E is the number of lone pairs. Therefore, you can figure out a molecules AXE by looking at the molecule.

Nina Do 4L
Posts: 61
Joined: Fri Sep 28, 2018 12:27 am

Re: AXE

Postby Nina Do 4L » Tue Nov 20, 2018 6:23 pm

When writing the VSEPR formula, you begin with A which is the central atom. And then E and the subscript number will depend on the amount of "things" it's attached to, regardless of bonds. Then you'd finish with E and the subscribe number will depend on the amount of LONE PAIRS. We count everything in pairs, not individually. Hope this helps!


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