MO Correlation Diagrams for Heteronuclear molecules

[Nadine_El Fawal_3M]

Drawing the correlation diagram for homonuclear atoms seems pretty straightforward if you follow the atomic charge and valence shell e- rule. In the course reader; however, it did mention drawing Correlation diagrams for heteronuclear molecules, taking into account the electronegativity of the atoms ("More electronegative atom has lower energy levels").

I'm kind of confused on how exactly that works and how we would draw the MO correlation diagram.

Thank you in advance!

[mikezargari]

Like you said the more electronegative atom's orbitals is drawn slightly lower than the less electronegative atom's orbitals. When you draw the lines that represent your 2s or 2p orbitals make sure they are lower for the more eneg atom. It should look a bit asymmetric.