And so what you're going to end up with is, well, let's go over that. Here is sodium and chloride.

你将以之结尾，好吧，我们跳过那个，这是钠和氯。

麻省理工公开课 - 固态化学导论课程节选

So, the sodium over here and the chlorine over here, they will be attracted to one another.

当钠离子和氯离子在一块时，它们会相互吸引。

麻省理工公开课 - 固态化学导论课程节选

If you flip the Periodic Table over you will have the ionization energy of sodium, first ionization energy, 5eV and it is about 5 eV which, when you convert, 496kJ/mol is a whopping 496 kilojoules per mole.

如果浏览周期表,你可以得到钠的离子化能，第一电离能，大约，当你转换的时候，是巨大的。

麻省理工公开课 - 固态化学导论课程节选

So, for example, if I have a sodium ion over here, and I have a chloride ion over here, where the distance from center to center r I'm denoting as r, this is nucleus to nucleus separation.

所以，比如这有一个钠离子，和一个氯离子，它们中心与中心间的距离,我把它设为，这是原子核和原子和的间距。

麻省理工公开课 - 固态化学导论课程节选