Question

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

 

a. He₂^-

b. He₂⁺

c. O₂^2-

d. Be₂

Answer 1

The correct answer is  d)  Be₂   

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

Chemical species	Bond Order
\(He_2^{-}\)	0.5
\(He_2^+\)	0.5
\(O^{2-}_2\)	1
\(Be_2\)	0