So, in this case, we're just drawing the molecular orbital diagram for the valence electrons, so we have three for each.

所以在这个例子里面，我们只需要画出,价电子的分子轨道图，所以每个有3个电子。

麻省理工公开课 - 化学原理课程节选

OK PROFESSOR: Valence electrons. OK, sometimes you're going to be asked to draw a molecular orbital diagram where you're asked to include all electrons, and sometimes it will specifically say only include valence electrons.

教授：价电子，有时候你画一幅分子轨道图,有时候要求你画出所有的电子，有时候特别要求,只包括价电子。

麻省理工公开课 - 化学原理课程节选

All right, so that's really all there is to thinking about valence bond theory in terms of the most simple explanation here.

好了，这就是,价电子轨道理论的,最简单的解释。

麻省理工公开课 - 化学原理课程节选

And to do this we're going to introduce valence bond theory, and the idea of hybridization of orbitals.

在这之前我们要引入价电子成键理论，和杂化轨道的概念。

麻省理工公开课 - 化学原理课程节选

So basically, that means one electron in an s orbital in their outer-most most shell.

因此基本上,这意味着那个在，s，轨道上价电子是最外层的。

麻省理工公开课 - 化学原理课程节选

So what I want to point out when you're kind of looking at these numbers here, what the significance is, look at that huge difference between what the ionization energies are for what we call those valence electrons, -- those outer shell electrons, those are core electrons there.

我在这里想要指出的是,当大家在看这些数字的时候，最重要的是，要看到这些,巨大的差异,看到所谓价电子，即外层电子的电离能与，1，s，轨道，电离能之间的巨大差异。

麻省理工公开课 - 化学原理课程节选