Shape of AX5E

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Megan Potter 1G
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Joined: Fri Apr 06, 2018 11:04 am

Shape of AX5E

Postby Megan Potter 1G » Sat Jun 09, 2018 10:22 pm

I know AX5E means 6 total regions of electron density, so an octahedral electron arrangement. However, one of the bonds is a lone pair, leaving 5 bonds from the central atom to other atoms. This would make a square pyramidal, which makes sense, but I was under the impression that a lone pair deflects other atom bonds more than other atoms do, which would make that base of 4 bonds point more upwards rather than lying at 90 degrees to the vertical bond. Is that correct and we still say its square pyramidal? or is that just wrong?

Bryan Jiang 1F
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Joined: Fri Apr 06, 2018 11:03 am
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Re: Shape of AX5E

Postby Bryan Jiang 1F » Sat Jun 09, 2018 11:19 pm

I think it is the very fact that the lone pair pushes the four bonded atoms down that creates the pyramidal shape. Of course, there is an additional axial/vertical bonded atom pointing down too, but the most characteristic feature of AX5E would be the depressed four bonded atoms from the lone pair.

AshleyLamba1H
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Joined: Fri Apr 06, 2018 11:03 am

Re: Shape of AX5E

Postby AshleyLamba1H » Sun Jun 10, 2018 12:06 am

I believe it is still a square pyramidal, however the bond angles would be slightly less than 90 degrees.

Samantha Draghi 1L
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Joined: Fri Apr 06, 2018 11:02 am

Re: Shape of AX5E

Postby Samantha Draghi 1L » Sun Jun 10, 2018 10:51 am

If the question is asking for the molecular geometry, a molecule with five bonds and an electron pair it would be square pyramidal, although if the question asks for the electron-pair geometry, the same molecule since it has six regions of electron density, it would be considered octahedral.

Johanna Caprietta 1E
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Joined: Fri Apr 06, 2018 11:02 am

Re: Shape of AX5E

Postby Johanna Caprietta 1E » Sun Jun 10, 2018 10:57 am

The shape would be a square pyramidal, with angles of about 90 degress and 180 degress. An eample of AX5E would be BrF5

Alondra Juarez section 1E
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Joined: Fri Sep 29, 2017 7:03 am

Re: Shape of AX5E

Postby Alondra Juarez section 1E » Sun Jun 10, 2018 10:40 pm

I believe that this would be a square pyramidal


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