When Z greater than or equal to 8 and Z<8 clarification

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Cecilia Tsai 3C
Posts: 16
Joined: Fri Sep 25, 2015 3:00 am

When Z greater than or equal to 8 and Z<8 clarification

Postby Cecilia Tsai 3C » Mon Nov 02, 2015 10:56 pm

Hi all,
I'm confused as to what Z is... and how the MO diagram looks when Z is greater than or equal to 8, and Z is less than 8.

So my question is, what is Z? If you have a molecule like CO, then what Z would you use to figure out what diagram to use?

For z<8, then
sigma is above pi

and z> or equal to 8, then
pi is above sigma

is that right? and why is that? Will the px, py, pz be the same?

Thanks!

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

Re: When Z greater than or equal to 8 and Z<8 clarification

Postby rachelbuechler » Mon Nov 02, 2015 11:09 pm

Z is the atomic number, and the nuclear charge is equal to the atomic number. for z<8, the sigma bond is above the pi bond. For z>8, the sigma bond is below the the pi bond. If you have a heteronuclear molecule, such as CO, sigma is always higher than the pi bond.


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