According to molecular orbital theory, the species among the following that does not exist is:

H e_{2}^{-}

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H e_{2}^{+}

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O_{2}^{2 -}

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B e_{2}

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Solution

The correct option is D $B e_{2}$
Electronic configuration of $B e_{2}$ according to MOT is:
$σ_{1 s^{2}} σ_{1 s^{2}}^{} σ_{2 s^{2}} σ_{2 s^{2}}^{}$
$Bond order = \frac{N_{b} - N_{a}}{2} = \frac{4 - 4}{2} = 0$
Since the bond order of $B e_{2}$ molecule is zero, it doesn't exist.

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