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

And so here is the Periodic Table in its glory today following on Mendeleev's scheme.

所以，这是周期表,今天非常光荣地跟在门捷列夫的图表之后。

麻省理工公开课 - 固态化学导论课程节选