BH3 All of our electrons are in our bonds, we want to got them a 120 degrees away from each other, that's as far away as we can get them.

比如说，它是这样的，所有的电子都在键中。

麻省理工公开课 - 化学原理课程节选

So, remember, boron was one of those exceptions to our Lewis structure rules where it was perfectly happy not having a full octet.

所以我们可以加上3个氢原子,对于BH3，这是个稳定结构,记住，B是Lewis结构的一个特例。

麻省理工公开课 - 化学原理课程节选