现在我们有4个未配对电子。

So now what we have is four unpaired electrons.

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自由基是一种具有未配对电子的分子碎体。

A free radical is a molecular fragment having an unpaired electron.

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同样，我们有未配对电子的配对，我们有两个轨道结合。

And again, we have the pairing of the unpaired electrons, and we have two orbitals coming together.

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So, if we hybridize just these three orbitals, what we're going to end up with is our s p 2 hybrid orbitals.

我们会看到现在有3个未配对的电子，可以成键。

麻省理工公开课 - 化学原理课程节选

So, electron promotion does not happen in terms of nitrogen, because it would not increased our number of unpaired electrons.

这里对于氮原子不会有电子激发，因为这不会增加,未配对电子的数目。

麻省理工公开课 - 化学原理课程节选

And again, we have the pairing of the unpaired electrons, and we have two orbitals coming together.

同样，我们有未配对电子的配对，我们有两个轨道结合。

麻省理工公开课 - 化学原理课程节选