Which of the following molecules does not exi | vedclass

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(B) According to molecular orbital theory,the bond order of a molecule is calculated as: $Bond \ Order = \frac{1}{2} (N_b - N_a)$,where $N_b$ is the n

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$Be_2$

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(B) According to molecular orbital theory,the bond order of a molecule is calculated as: $Bond \ Order = \frac{1}{2} (N_b - N_a)$,where $N_b$ is the number of bonding electrons and $N_a$ is the number of antibonding electrons.For $Be_2$ ($Z=4$,total $8$ electrons),the electronic configuration is: $\sigma 1s^2, \sigma^* 1s^2, \sigma 2s^2, \sigma^* 2s^2$.Here,$N_b = 4$ and $N_a = 4$.$Bond \ Order = \frac{1}{2} (4 - 4) = 0$.Since the bond order is $0$,the $Be_2$ molecule is unstable and does not exist.

Which of the following molecules does not exist according to molecular orbital theory?

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