So the last thing I want to mention today is how we can think about electron configurations for ions.

今天我想提到的最后一件事,就是我们怎样考虑离子的,电子构型。

麻省理工公开课 - 化学原理课程节选

So writing out electron configurations I realize is something that a lot of you had experience many of you are very comfortable doing it, especially for the more straightforward atoms.

所以我认为写出电子构型是,你们大多数在高中,你们大多数可能都非常熟练做出它，特别是对于更为简单的原子。

麻省理工公开课 - 化学原理课程节选

So there are two electron configurations in the n equals one shell, if we follow according to the selection rules that we spelled out last day.

如果根据上次课,我们阐明的原子光谱选择定则，我们就会知道在n等于1的那一层,有两种电子图像构型。

麻省理工公开课 - 固态化学导论课程节选

But we'll go over that, particularly some exceptions, when we're filling in electron configurations, and how we would go about doing that for positive ions, which follow a little bit of a different procedure.

但是我们将会重温它们，特别是一个特例，当我们填充一个电子构型，而且我们会如何着手,处理阳离子，它遵从一些别的不同的过程。

麻省理工公开课 - 化学原理课程节选

So you might ask in terms of when you're writing electron configurations, which way should you write it.

所以你们可能会问当你们,在写电子构型的时候，在写电子构型的时候。

麻省理工公开课 - 化学原理课程节选

What you saw, what we've done a lot of is drawing the electron configurations for different atoms, we can do the same thing for a molecule.

你们会看到，我们已经画过很多,不同原子的电子构型，我们也可以对分子做同样的事情。

麻省理工公开课 - 化学原理课程节选

So now we can go back and think about filling in these electron configurations for any atom.

实用现在我们返回来再考虑,关于填充任意原子,电子构型的问题。

麻省理工公开课 - 化学原理课程节选

So if you flip the info page over on the back here, what you'll see is the periodic table, this is the same one that I've handed out in the last two lectures - the periodic table without any electron configurations.

将这张纸翻过来，你可以看到一个元素周期表，这与我们前两次课发过的,是一样的,-没有任何电子排布的周期表。

麻省理工公开课 - 化学原理课程节选

So I put the electron configurations and actually drew it on an energy diagram here, so we can actually think about why this might be happening.

所以我写出了它们的电子排布,并画成了能级图的形式，这样我们就可以好好想一想,这个问题发生的原因。

麻省理工公开课 - 化学原理课程节选

So the way that we like to think of things now is in terms of electron configurations, right, but at the time that wasn't really understood.

当然我们现在思考,这些更喜欢采用电子排布的观点，但在当时还没有这种概念。

麻省理工公开课 - 化学原理课程节选

But it looks like you guys are all experts here on doing these electron configurations.

所以但是看起来你们在,做电子构型方面都是专家了。

麻省理工公开课 - 化学原理课程节选

So, whichever works best for you can do in terms of figuring out electron configurations.

所以不管哪一个你们用的最好,都可以写出电子构型。

麻省理工公开课 - 化学原理课程节选

So, let's see how some of this works, and hopefully your counterparts from 100 years ago would also be able to think about how this works, even if they don't have the quantum mechanics behind the individual electron configurations for atoms.

那么，下面让我们来看一下它是怎么用的，希望一百年前想你们一样的同学,也能够弄懂它为什么能用，尽管他们没有量子力学,不知道原子的电子排布。

麻省理工公开课 - 化学原理课程节选

So, let's move on to some more complicated electron configurations.

让我们看看一些更复杂的,电子构型。

麻省理工公开课 - 化学原理课程节选

So if you want to on an exam, you can just write this down quickly at the beginning and refer to it as you're filling up your electron configurations, but also if you look at the periodic table it's very clear as you try to fill it up that way that the same order comes out of that.

如果你们想要在考试中，你们要在开始时快速地把这个写下来,然后在填充电子构型,的时候参考它，但是如果你们看着周期表,它就非常清楚了当你们将它用从那产生的,同样的顺序来填充。

麻省理工公开课 - 化学原理课程节选

And in terms of doing this for your homework, I actually want to mention that in the back page of your notes I attached a periodic table that does not have electron configurations on them. It's better to practice doing electron configurations when you cannot actually see the electron configurations.

关于你们的作业，是在你们讲义的后面的页,我附上了一张,没有给出电子构型的周期表,最好联系一下做出电子构型,当你们实际上看不到,电子构型的时候。

麻省理工公开课 - 化学原理课程节选

So we can compare the two electron configurations, and we can actually think about what we figure out from them, we see that two are lowered in energy, two electrons are raised in energy, so we have no net gain or no net loss in energy for h e 2.

我们可以比较两种电子构型，我们可以考虑,我们发现这，两个电子能量变低，两个电子能量升高，所以在He2里没有净的能量得失。

麻省理工公开课 - 化学原理课程节选