MO Diagram difference

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MO Diagram difference

Postby Jose_Arambulo_2I » Tue Nov 08, 2016 4:59 pm

I'm still unclear as to why the sigma p orbitals and pi p orbitals switch depending on nuclear charge. What exactly causes this to take place?

Kathy Vu 3L
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Joined: Fri Jul 15, 2016 3:00 am

Re: MO Diagram difference

Postby Kathy Vu 3L » Tue Nov 08, 2016 8:55 pm

It has to deal with electron repulsion. For z<8, π2p MO’s are filled before the σ2p MO because there is less electron-electron repulsion between the π2p and the σ2s and the σ2s*. For z>8, σ2s and σ2s* MO’s are closer because greater nuclear charge, therefore the σ2p MO's will react less strongly with them and be lower in energy than the π2p MO’s.

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