What is the bond order (BO) in He2, He2+? Which one is stable?
(a) He2: BO = 0, stable, He2+: BO = -1, unstable.
(b) He2: BO = 0, unstable, He2+: BO = 1, unstable.
(c) He2: BO = 0, unstable, He2+: BO = 1, stable.
(d) He2: BO = 2, stable, He2+: BO = 1, unstable.
(e) none of the above.
Answer: none of the above