- Every molecule has a hierarchy of bonds.
- Each molecule has a unique bond configuration.
- Half of the difference between the number of electrons in bond-free (nonbonding) and bond-filled (bonded) molecular orbitals is used to compute the bond order.
The formula to calculate the bond order:
BO = NB - NA/2
The quantity of electrons present in the bonding and antibonding molecular orbitals, is NA, NB
Step 1: Bond order calculation for a particular species:
BO for O2 = ½ (10 - 6) = 2
BO for O2- = ½ (10 - 7) = 1.5
BO for O2+ = ½ (10 - 5) = 2.5
BO for O22- = ½ (10 - 8) = 1
Step 2: Let us arrange according to increasing bond length
O22- < O2- < O2 < O2+
The increasing order of the bond order of O2, O2-. O2+ and O22-?
O22- < O2- < O2 < O2+ is the increasing order of the bond order of O2, O2-. O2+ and O22- . The bond order is found by the total covalently bound electron pair numbers present in two atoms of a molecule.