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    The relative E ordering is π px and π py < σ pz if Z < 8. The relative E ordering is σ pz < π px and π py if Z = or > 8 for any row two elements and other examples we will see in this course (or on the exam). For heteronuclear diatomic molecules: The relative E ordering is π px and π py < σ pz if Z < 8 for both atoms.

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