March 8: n and o , mos for homonuclear diatomics, heteronuclear diatomic molecules, The energy in the pi bonds is lower than the energy for the sigma bonds. The electrons end on a sigma level which shows why the sigma bond is higher in energy. The molecule is in a stable form and the bond order is 3. If you were to draw an mo diagram for n - than you would have to add an electron into the system which than would change the highest energy level and raise the energy for the entire system. The highest energy level for this mo is the pi bond, the sigma bond is much lower than either of the pi bonds. The two unpaired electrons in the highest energy level will decrease the bond order and therefore weaken the bond. The bond order for the molecule is 2. This diagram shows the magnetic properties that align with mos.
