And what I want to point out that we just figured out for molecular orbital theory, is that o 2 is a biradical, because remember, the definition of a radical is when we have an unpaired electron.

我要指出的是,我们刚利用分子轨道理论，指导了O2是二价自由基，因为记住，自由基的定义是,有个未配对的电子。

麻省理工公开课 - 化学原理课程节选

This was something we could not predict using Lewis structures, but we can predict using MO theory that we have a radical species here.

这是我们从Lewis结构里不能预测的，但我们可以用分子轨道理论,预测自由基。

麻省理工公开课 - 化学原理课程节选