Exercise 9 | Bonding Theories

Arrange the following molecular ions in order of increasing bond dissociation energy:

N2+, NO+, O2+, Li2+, Be2+

Higher bond order ⇒ stronger bond ⇒ higher bond dissociation energy

Bond order: N2+ = 2.5, NO+ = 3, O2+ = 2.5, Li2+ = 0.5, Be2+ = 0.5

In order of increasing bond dissociation energy:
Li2+ ~ Be2+ < N2+ ~ O2+ < NO+