(B) The species $Be_2$ does not exist under normal conditions.The electronic configuration of $Be_2$ ($Z=4$,total $8$ electrons) is: $\sigma 1s^2 \sig

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(B) The species $Be_2$ does not exist under normal conditions.The electronic configuration of $Be_2$ ($Z=4$,total $8$ electrons) is: $\sigma 1s^2 \sigma^* 1s^2 \sigma 2s^2 \sigma^* 2s^2$.The bond order is calculated as: $\text{Bond order} = \frac{N_b - N_a}{2} = \frac{4 - 4}{2} = 0$.Since the bond order is $0$,the molecule is unstable and does not exist.