Whether molecular ion `HeH^(Θ)` exist or not? Explain.

Explanation

Do not exist:
Total number of `e^(-)'s` in `HeH^(ө)=2+1+1=4`.
Therefore, its electronic configuration =`sigma 1s^(2) sigma** 1s^(2)`.
Therefore, bond order`1/2(2-2)=0`.
Since bond order is zero, so this ion does not exist.