It uses an approximation called LCAO, and when applied to a heteronuclear molecule, places the more electronegative atom at a lower (*) energy level.
This theory describes how liquid oxygen has both a double bond and is paramagnetic. It can be used to explain why dihelium (dye-"HELIUM") does not exist but the dihelium plus one ion can theoretically exist. It uses an approximation called LCAO, and when applied to a heteronuclear molecule, places the more electronegative atom at a lower (*) energy level. When applied to dioxygen, it contains energy levels denoted sigma and pi, and sigma star and pi star. For 10 points, name this theory which places electrons into bonding and anti-bonding energy levels.
This theory describes how liquid oxygen has both a double bond and is paramagnetic.
{molecular orbital} theory [or {MO} theory]