Which of the following molecules does not exi | vedclass

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(C) According to Molecular Orbital Theory,the bond order is calculated as: $Bond \ Order = \frac{1}{2} (N_b - N_a)$,where $N_b$ is the number of elect

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$He_2$

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(C) According to Molecular Orbital Theory,the bond order is calculated as: $Bond \ Order = \frac{1}{2} (N_b - N_a)$,where $N_b$ is the number of electrons in bonding orbitals and $N_a$ is the number of electrons in antibonding orbitals.For $He_2$,the electronic configuration is $\sigma 1s^2, \sigma^* 1s^2$.Bond order = $\frac{1}{2} (2 - 2) = 0$.Since the bond order is $0$,the molecule $He_2$ does not exist.

Which of the following molecules does not exist on the basis of Molecular Orbital Theory?

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