And also I wanted to mention in terms of checking your Lewis structures, regardless of what they are, you should always go back and I had 10, and then count 2, 4, 6, 8, 10, because you always need to make sure you have the same number of valence electrons that you calculated in your actual structure.

我还想提一点关于检查,你的路易斯结构的建议，不管它们是什么，你总是应该回去检查一下,我有十个，然后数一数，二，四，六，八，十个，因为你总是需要确保实际价电子的数量,与你在结构中算出的数量相等。

麻省理工公开课 - 化学原理课程节选

And again, I want you to have practiced drawing these out in the form you always need to start with the sigma and then write the number of the orbital.

同样的，我希望你们,练习画这种图,你总是要从sigma开始,然后写出轨道数目。

麻省理工公开课 - 化学原理课程节选