The first ionization energy of lithium is about 5.4 electron volts per atom.

锂的一级电离能，大约是每原子5。4电子伏。

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Well, if we look on the chart, the first ionization energy is what is reported in your Periodic Table.

如果我们查阅图表，一级电离能，已经在元素周期表上标示了。

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Whenever you hear the term ionization energy, make sure you keep in mind that unless we say otherwise, we're talking about that first ionization energy.

但无论什么时候你听到电离能这个词，一定要记得，除非特别说明，我们都是在说第一电离能。

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And specifically, when we talk about ionization energy, it's assumed that what we mean is actually the first ionization energy.

特别地，当我们讨论电离能的时候，我们默认,这指的是第一电离能。

麻省理工公开课 - 化学原理课程节选

Well, if we look on the chart, the first ionization energy is what is reported in your Periodic Table.

如果我们查阅图表，一级电离能,已经在元素周期表上标示了。

麻省理工公开课 - 固态化学导论课程节选

So, if we want to think about what the first ionization energy is of boron, what you want to do is write out the electron configuration, because then you can think about where it is that the electron's coming out of.

如果我们要考虑,硼的第一电离能，你首先要做的是写出它的电子排布，因为在这之后,你才能知道拿走的是哪里的电子。

麻省理工公开课 - 化学原理课程节选