So in terms of total numbers that we would need to complete our octets and fill our valence shells, we would need 18 electrons.

因此要填满我们的“八隅体“,排满所有的价壳层，我们总共需要十八个电子。

麻省理工公开课 - 化学原理课程节选

The reason is because we already have a full valence shell for our hydrogen, it doesn't want any more electrons.

原因是因为我们的氢,已经有一个排满的价壳层了，它不再需要多余的电子了。

麻省理工公开课 - 化学原理课程节选

Step three in our Lewis structure rules is to figure out how many electrons we would need in order for every single atom in our molecule to have a full valence shell.

路易斯结构规则的第三步是,找出让分子中每个原子的价壳层,都排满应该需要多少个价电子。

麻省理工公开课 - 化学原理课程节选

How many electrons do we need to have full valence shells?

要把价层排满需要多少个电子？

麻省理工公开课 - 化学原理课程节选

So remember, that when we talked about Lewis structure, the organizing principle behind Lewis structures is the idea that within the molecule the atoms are going to arrange their valence electrons, such that each atom within the molecule has a complete octet or full outer shell.

记得，当我们讨论路易斯结构的时候，路易斯结构所遵循的组织原则是这样一种思路,那就是分子中的原子都倾向于,重新安排它们的价电子,使得分子有一个完整的,“八隅体“或者排满的外壳层。

麻省理工公开课 - 化学原理课程节选

So we actually only need two electrons to fill up the valence shell of hydrogen, remember that's because all we need to fill up is the 1 s.

我们其实只需要两个电子,就可以将氢的价壳层排满，要记得这是因为我们只需要排满，1，s，轨道。

麻省理工公开课 - 化学原理课程节选