MO Energy Diagrams for non-diamtomics

[Junghyuk_Park_1I]

How do we draw the the molecular orbital diagrams for hetero-nuclear molecules (i.e. HF, CO, NO)? Because one of the atoms is Z<8 and the other Z>8, do we put the pi 2p or sigma 2p above or below? How do we know which one it behaves like?

[Abbas_Hakim_1B]

For hetero-nuclear molecules (i.e. HF, CO, NO), you would use the molecular orbital diagram for z<8. So the pi 2p would be below the sigma 2p. Question 6 of the Fall Midterm 2014 in the course reader is an example for NO