Let's move on to the last topic in terms of this first exam, which is thinking about the idea of isoelectronic atoms, or isoelectronic ions. And isoelectronic is very straightforward, it just means having the same electron configuration.

下面我们继续讲第一次考试的最后一个主题，也就是等电子原子，或等电子离子的概念，“等电子的“是非常直接的表达，它的意思就是具有相同电子排布的。

麻省理工公开课 - 化学原理课程节选

So, that's the idea of isoelectronic ions.

好，这就是等电子离子的概念。

麻省理工公开课 - 化学原理课程节选

And then, if we have time at the end, we'll introduce one last topic, which is isoelectronic atoms and ions.

最后，如果有时间的话，我们将再介绍最后一个主题：,等电子原子与离子。

麻省理工公开课 - 化学原理课程节选

And now we're asking you to look at krypton, so the atomic mass is 36. You can actually just grab that handout the second handout on the exam and look at the periodic table there. So, which of the following ions listed is isoelectronic with krypton?

现在我们请大家来看一下氪原子，它的原子量是，36，大家其实可以拿出这张讲义,第二份关于考试的讲义,看一下上面的周期表，那么，下列离子中，哪一个是与氪原子是等电子的？

麻省理工公开课 - 化学原理课程节选