Molecular Orbitals(MOs) Pi molecular orbitals are the sideways overlap of p orbitals. -p orbitals have two lobes.Plus (+)and minus (-)indicate the opposite phases of the wave function,not electrical charges. When lobes overlap constructively (and + or-and-),a bonding MO is formed. When and lobes overlap,waves cancel out and a node forms;antibonding MO. Chapter 15 6 Chapter 15 6 Molecular Orbitals (MOs) ▪ Pi molecular orbitals are the sideways overlap of p orbitals. ▪ p orbitals have two lobes. Plus (+) and minus (-) indicate the opposite phases of the wave function, not electrical charges. ▪ When lobes overlap constructively (+ and +, or - and -), a bonding MO is formed. ▪ When + and - lobes overlap, waves cancel out and a node forms; antibonding MO