Which one of the following species does not exist under normal conditions?

{B e_{2}}^{+}

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B e_{2}

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B_{2}

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i_{2}

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Solution

The correct option is D $B e_{2}$
$B e_{2}$ does not exist under normal condition. Beryllium has four electrons , so electronic configuration of $B e_{2}$ having 8 electrons will be $σ 1 s^{2} σ^{} 1 s^{2} σ 2 s^{2} σ^{} 2 s^{2}$ and the bond order is
$\frac{N_{a} - N_{b}}{2} = 0$
Since $B e_{2}$ is having bond order 0 , no bond is formed between the two atoms. Hence $B e_{2}$ is unstable

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