MO: Molecular Orbital AO: Atomic Orbital 
The number of MO's formed from AO's totals the number of reacting AO's Example: 2 AO's form 2 MO's – 1 bonding MO & 1 antibonding MO How does this happen? Bonding MO's are formed by constructive interference between AO's and antibonding MO's by destructive interference between AO's. To form both a bonding and antibonding MO this suggests the AO's must be simultaneously constructively and destructively interfering which doesn't make sense. Have I misinterpreted this concept?
