According to MOT calculations, which of the following diatomic molecules possesses a bond order of z — Chemical Bonding Chemistry Question

💡 Solution & Explanation

$He_2$ has 4 electrons. Its configuration is $\sigma 1s^2, \sigma^* 1s^2$. Bonding electrons ($N_b = 2$) equal antibonding electrons ($N_a = 2$). Bond Order = $(2-2)/2 = 0$, meaning no net bond formation.