这是二级电离能，这就是说，电子数第二多的电离能。
That is to say the ionization energy of the second most electron.
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。
Well, if we look on the chart, the first ionization energy is what is reported in your Periodic Table.
锂的一级电离能，大约是每原子5。4电子伏。
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。
The first ionization energy of lithium is about 5.4 electron volts per atom.
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