Pentagonal Bipyramidal

[Andrew Pfeiffer 2E]

In the textbook, the molecular shape pentagonal bipyramidal (7 regions of high electron concentration) shows up a couple of times. We haven't really discussed this shape in depth in class, so will we be held accountable for it on test 2? Also, what molecules would have this shape?

[LeAirraBullingor2k]

I'm sure this will be included in the test since that entire section (2E) is on the syllabus.

[KDang_1D]

What is the VSEPR formula (AXE) for this?

[Wilson 2E]

Pentagonal Bipyramidal is AX7, so one more bonding site than octahedral (AX6).

[Yuri Lin 4H]

Also, one example of a pentagonal bipyramidal molecule would be IF7.

[Ruth Glauber 1C]

Does anyone know where in the textbook I could find a diagram for this?

[Verity Lai 2K]

Since Lavelle didn't discuss it in class I don't think we have to know it. I think molecules with more than 6 areas of electron density are pretty rare.

[KDang_1D]

What other VSEPR structures do we need to know that Dr. Lavelle didn't go over in lecture?

[Wilson 2E]

We most likely don't need to know it, but just in case the structure is a pentagonal formation on the equatorial plane along with one atom below and one above. Essentially trigonal bipyramidal, but instead of only 3 atoms in the middle it's 5 instead.