We're going to release a lot of energy for bonding, it's going to more than make up for the fact that we actually had to spend some energy to promote that electron.

在成键时，会释放大量能量,这比补偿激发电子,的能量要多。

麻省理工公开课 - 化学原理课程节选

putting all those things together, if you looked at this question again we'd get 100% on it, 0 9 that our only option here is 0. 9, and that it's not the negative, it's the positive version, because we're talking about how much energy we have to put into the system in order to eject an electron.

把这些放在一起，你们再看一下题目,大家100%都能选对，我们唯一的选择就是这个，它不是负数，它是正的，因为我们说的，是要,把电子激发出来,需要提供的能量。

麻省理工公开课 - 化学原理课程节选

So if we're going to eject an electron using a minimum amount of energy, that's where it's going to come from.

因此，如果我们要用最少的能量,激发出一个电子，那这个电子一定是，2，p，轨道上的。

麻省理工公开课 - 化学原理课程节选

And we can think about here we did get that energy for electron promotion that I mentioned before 2p where we moved the electron from the 2 s to the 2 p.

我们可以考虑,我们从哪里,获得了能量使电子,从2s激发到。

麻省理工公开课 - 化学原理课程节选

Well, we can't guarantee with UV light we'll have enough energy to eject every single electron, so that's why when we use x-rays, they're higher energy, you can pretty much be guaranteed we're going to eject all of those electrons there.

好，我们不能保证紫外光有足够的能量,激发出每一个电子，所以我们要使用，X，射线，它的能量更高，你可以非常确定,我们可以激发出其中所有的电子。

麻省理工公开课 - 化学原理课程节选