According to molecular theory, the species among the following that does not exist is
According to molecular theory, the species among the following that does not exist is
- [JEE MAIN 2021]
- A
$He _{2}^{+}$
- B
$He _{2}^{-}$
- C
$Be _{2}$
- D
$O _{2}^{2-}$
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