According to molecular theory,

Question:

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

  1. $\mathrm{He}_{2}^{+}$

  2. $\mathrm{He}_{2}^{-}$

  3. $\mathrm{Be}_{2}$

  4. $\mathrm{O}_{2}^{2-}$

Correct Option: , 3

Solution:

According to M.O.T. If bond order of chemical species is zero then that chemical species does not exist.

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