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