MO Diagram Rules

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704597525
Posts: 9
Joined: Fri Sep 25, 2015 3:00 am

MO Diagram Rules

Postby 704597525 » Fri Nov 06, 2015 2:19 pm

Hi!
When Lavelle talked in lecture, he discussed the idea that the MO Diagram is different for an atomic number of 8 or lower versus an atomic number of 8 or high. What is the difference and what diagram do we use for oxygen since it is 8 and the breaking point number?
Thanks!

Heerali Patel 3A
Posts: 26
Joined: Fri Sep 25, 2015 3:00 am

Re: MO Diagram Rules

Postby Heerali Patel 3A » Fri Nov 06, 2015 2:35 pm

The difference is that for any atom with atomic number, Z, less than 8, the MO diagram will have the sigma(pz) orbital at a higher energy than the pi(px) and pi(py) orbitals due to electron-electron repulsion. For any atom with Z greater than or equal to 8, the MO diagram will be the opposite, meaning the sigma(pz) will be at a lower energy. Therefore, oxygen will have an MO diagram following the Z>8 diagram.

EPerez1B
Posts: 27
Joined: Fri Sep 25, 2015 3:00 am

Re: MO Diagram Rules

Postby EPerez1B » Tue Nov 24, 2015 8:04 pm

As a side note, if you're doing the MO diagram for a molecule with one atom that is Z>8, and one atom that is Z<8, use the MO diagram for Z>8.


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