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Arrange the species Li2, Li2- and Li2+ in increasing order of stability.
- Li2 < Li2+ < Li2-
- Li2- < Li2+ < Li2
- Li2 < Li2- < Li2+
- Li2- < Li2 < Li2+
Correct answer: Li2- < Li2+ < Li2
Solution
Li2 has bond order 1, Li2+ has bond order 0.5, and Li2- also has bond order 0.5 but with an electron in an antibonding orbital making it slightly less stable, so the order is Li2- < Li2+ < Li2.
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