Octahedral

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

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Marsenne Cabral 1A
Posts: 59
Joined: Fri Sep 28, 2018 12:19 am

Octahedral

Postby Marsenne Cabral 1A » Fri Nov 16, 2018 5:24 pm

What is the VSEPR notation for a molecule with an octahedral shape?

Hai-Lin Yeh 1J
Posts: 89
Joined: Fri Sep 28, 2018 12:16 am
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Re: Octahedral

Postby Hai-Lin Yeh 1J » Fri Nov 16, 2018 5:27 pm

For 6 electron pairs:

Octahedral: AX6
Square pyramidal: AX5E
Square planar: AX4E2

Jovian Cheung 1K
Posts: 48
Joined: Fri Sep 28, 2018 12:16 am

Re: Octahedral

Postby Jovian Cheung 1K » Fri Nov 16, 2018 5:36 pm

Hai-Lin Yeh wrote:For 6 electron pairs:

Octahedral: AX6
Square pyramidal: AX5E
Square planar: AX4E2


Just to clarify a bit more for the OP, these 3 molecular shapes (octahedral, square pyramidal, square planar) all have the electron domain arrangement/configuration 'octahedral'.

But only AX6 has both octahedral electron domain arrangement AND shape!

Hopefully this helps :-)

Danny Elias Dis 1E
Posts: 60
Joined: Fri Sep 28, 2018 12:19 am

Re: Octahedral

Postby Danny Elias Dis 1E » Fri Nov 16, 2018 11:49 pm

Do the bond angles of the octahedral shape (90 degrees) ever change (because of things like electron pairs)?

Jeannine 1I
Posts: 73
Joined: Fri Sep 28, 2018 12:27 am

Re: Octahedral

Postby Jeannine 1I » Sat Nov 17, 2018 12:22 am

Danny Elias Dis 1E wrote:Do the bond angles of the octahedral shape (90 degrees) ever change (because of things like electron pairs)?


I believe if there is only one electron pair (AX5E), it will slightly push the other 4 bonded atoms further away from it, so that the angle between the central atom, the opposite atom from the electron pair, and any one of the four remaining bonded atoms will be slightly less than 90 degrees.

If there are two electron pairs, (AX4E2), the electron pairs will be located opposite of each other, so although they both are pushing the 4 atoms around them away, the atoms have no more space to move away, so all bond angles remain 90 degrees.


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