But, in fact, we can also talk about the ionization energy of different states of the hydrogen atom or of any atom.

但实际上我们也可以讨论氢原子,或者其它任何原子的其它能级的电离能。

麻省理工公开课 - 化学原理课程节选

So, this allows us to look at a bunch of different atoms, of course, limited to the fact that it has to be a 1 electron atom.

所以这让我们可以研究很多原子，只要它们都只有一个电子。

麻省理工公开课 - 化学原理课程节选

that's one way to think about it, and there's also another way, and this is the way that your book presents it. If you, in fact, have two of the same atom right next to each other, let's say you have a crystal, or let's say you're talking about a metal, what you can do is just look at the distance between the two nuclei, and split that in 1/2, and take the atomic radius that way.

这只是一种定义的思路，另外还有其它方法，也就是你们课本上的方法，如果你，事实上，有两个相同的原子彼此靠在一起，比如说你有一个晶体，或者说你讨论的是一个金属，你所要做的就是,看看这两个原子核之间的距离，然后将距离除以二，就得到了这个原子的半径。

麻省理工公开课 - 化学原理课程节选

The more important thing that I want you to notice when you're looking at this wave equation for a 1 s h atom, is the fact that if you look at the angular component of the wave function, you'll notice that it's a constant.

我要你们注意的,更重要的一点是,当你们看到,这个氢原子1s轨道方程的时候，如果你们看,波函数，的角向部分，你们会发现它是一个常数。

麻省理工公开课 - 化学原理课程节选