MCQ
According to molecular theory, the species among the following that does not exist is
  • A
    $He _{2}^{+}$
  • B
    $He _{2}^{-}$
  • $Be _{2}$
  • D
    $O _{2}^{2-}$

Answer

Correct option: C.
$Be _{2}$
c
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.

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