MO Diagram difference

Moderators: Chem_Mod, Chem_Admin

Jose_Arambulo_2I
Posts: 35
Joined: Wed Sep 21, 2016 2:59 pm

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
Posts: 24
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.


Return to “*Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)”

Who is online

Users browsing this forum: No registered users and 1 guest