And remember, we're only talking about valence electrons, so the outer-most shells.

要记得，我们讨论的只是价电子，也就是最外层的电子。

youdao

This should make a lot of sense, because we know that a hydrogen has 1 s as it's outer-most or valence orbital, so it can be filled up just with two 1 s electrons.

这也是很合理的，因为我们,知道氢只有，1，s，轨道,这就是它最外层的轨道或者说价轨道，因此只要两个，1，s，电子就可以将它填满。

youdao

These elements, unlike the transition elements, do not exhibit variable oxidation states, and their valence electrons are only present in their outer shell.

这些元素，不像过渡金属那样显示出可变的化合价，他们只有最外层电子参加反应。

youdao

So the 3 s 1, or any of the other electrons that are in the outer-most shell, those are what we call our valence electrons, and those are where all the excitement happens.

它们是经常发生激发情况的,那也是我们所看到，我们称之为价电子，它们是经常发生激发情况的。

麻省理工公开课 - 化学原理课程节选

So let's do a quick clicker question, and you tell me how many valence electrons does fluorine have? Remember, valence electrons are different from core, they're only the outer-most electrons in the outer-most shell.

那么让我们来做一个小选择题，请大家来告诉我,氟有多少个价电子，要记得，价电子与芯电子不同，它们是在最外壳层的最靠外面的电子。

麻省理工公开课 - 化学原理课程节选

And, these outer shell electrons are termed valence electrons.

这些外层电子被,称作价电子。

麻省理工公开课 - 固态化学导论课程节选