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EEJ MAIN Chemistry QUESTION #5553
Question 1
According to Molecular Orbital Theory, which statement correctly describes $Li_2^+$ and $Li_2^-$?
  • $Li_2^+$ is unstable and $Li_2^-$ is stable
  • $Li_2^+$ is stable and $Li_2^-$ is unstable
  • Both are stable✔️
  • Both are unstable
Correct Answer Explanation
$Li_2^+$ bond order = $\frac{1}{2}(3-2) = 0.5 > 0$ → stable. $Li_2^-$ bond order = $\frac{1}{2}(4-3) = 0.5 > 0$ → stable. Both species have positive bond orders and can exist as stable (though weakly bonded) species.