Electron affinity, however, can be either negative or it can be positive.

但是，电子亲和能既可以是负的，也可以是正的。

youdao

But it didn't matter under those conditions because an electron could then never jump into one of the states of negative energy.

但它在那些情况下并不成为问题，因为一个电子永远不可能跃迁到任何一个负能态之中。

youdao

So most of you recognize, if we switch back to the notes, that they do have a negative electron affinity.

看来大部人都想到了，如果你翻翻讲义的话，它们的电子亲和能确实是负的。

youdao

So, what we're looking at here is the force when we have two charged particles, one positive one negative -- here, the nucleus and an electron.

我们现在研究的是,一正一负俩个带电粒子之间的,作用力-在这里。

麻省理工公开课 - 化学原理课程节选

The negative ions, these are electron-rich.

二负离子，它们有富裕的电子。

麻省理工公开课 - 固态化学导论课程节选