Q. Which one of the following species does not exist under normal conditions?
A) Li₂
B) Be₂⁺
C) Be₂
D) B₂
Explanation
[Solution from source] Be₂ has 8 electrons: σ1s² σ*1s² σ2s² σ*2s², bond order (4 − 4)/2 = 0, so it does not exist. Li₂ (bond order 1), Be₂⁺ (bond order ½) and B₂ (bond order 1) have positive bond orders. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.