So we haven't gotten to molecules yet, we're just talking about single atoms or single ions, but what's nice is just talking about this very straightforward principle of atomic radius.

我们还没有开始讲分子，我们仍然只是在讨论单个原子或离子，但它的好处在于可以讨论,这个关于原子半径的非常简单直接的原理。

麻省理工公开课 - 化学原理课程节选

What you see is that the radius changes with atomic number for constant electron number.

对于等电子数的粒子，离子半径随着,原子数的变化而变化。

麻省理工公开课 - 固态化学导论课程节选

This is ionic radii with a noble gas configuration.

这是稀有气体的离子半径。

麻省理工公开课 - 固态化学导论课程节选

3 It is 1.45. Ten electrons again, 1.33.

稀有气体的离子半径为1。45，而10电子的为1。

麻省理工公开课 - 固态化学导论课程节选

r+ And let's say that sodium has a radius, r plus, r- and chlorine has a radius, r minus, when r is very large in comparison to the radii of the ions, I don't need to draw them this way.

让我们假设钠有半径，是，氯也有半径，是，当r比离子半径大很多的时候，我不需要这样来描述。

麻省理工公开课 - 固态化学导论课程节选