Which species has a bond order of 0.5 and is stable?
For H₂⁺ : (sigma 1s)¹ . Bonding = 1, antibonding = 0. Bond order = (1 - 0/2) = 0.5 , and it exists as a stable ion.
Ref: NCERT Class 11 Chemistry > Chapter 4: Chemical Bonding and Molecular Structure > Topic: Kossel-Lewis Approach and Octet Rule and Lewis Structures