The molecular electronic configuration of $B e_{2}$ is:

σ 1 s^{2}, σ^{*} 1 s^{2}, σ 2 s^{2}, σ^{*} 2 p^{2}

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σ 1 s^{2}, σ 2 s^{2}

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σ 1 s^{2}, σ^{*} 1 s^{2}, σ 2 s^{2}, σ^{*} 2 s^{2}

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none of the above

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Solution

The correct option is B $σ 1 s^{2}, σ^{} 1 s^{2}, σ 2 s^{2}, σ^{} 2 s^{2}$
Total no. of electrons in ${B e}_{2}$ $= 8$ .
Electronic configuration according to molecular orbital theory:
$σ 1 s^{2}, σ^{} 1 s^{2}, σ 2 s^{2}, σ^{} 2 s^{2}$

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