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

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Chemical Species Bond Order He 2 + 0 . 5 He 2 - 0 . 5 Be 2 0 O 2 2 - 1 According to M.O.T. If bond order of chemical species is zero then that chemical species does not exist. The bond order (half the difference in the numbers of bonding and antibonding electrons) for such a diatomic entity is zero.

Chemical Species	Bond Order
${He}_{2}^{+}$	$0.5$
${He}_{2}^{-}$	$0.5$
${Be}_{2}$	$0$
$O_{2}^{2 -}$	$1$

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