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Shape of AX5E

Posted: Sat Jun 09, 2018 10:22 pm
by Megan Potter 1G
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?

Re: Shape of AX5E

Posted: Sat Jun 09, 2018 11:19 pm
by Bryan Jiang 1F
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.

Re: Shape of AX5E

Posted: Sun Jun 10, 2018 12:06 am
by AshleyLamba1H
I believe it is still a square pyramidal, however the bond angles would be slightly less than 90 degrees.

Re: Shape of AX5E

Posted: Sun Jun 10, 2018 10:51 am
by Samantha Draghi 1L
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.

Re: Shape of AX5E

Posted: Sun Jun 10, 2018 10:57 am
by Johanna Caprietta 1E
The shape would be a square pyramidal, with angles of about 90 degress and 180 degress. An eample of AX5E would be BrF5

Re: Shape of AX5E

Posted: Sun Jun 10, 2018 10:40 pm
by Alondra Juarez section 1E
I believe that this would be a square pyramidal