Now, it's not going to be symmetric is it, because there's two fluorines and two chlorines.

现在，它将不会对称，因为有两个氟原子和两个氯原子。

麻省理工公开课 - 固态化学导论课程节选

And if we talk about chlorine, and both of the chlorines are the same in this case, we start with a valence number of 7 for chlorine, and then we subtract 6, because it had 6 lone pair electrons around each of the chlorine atoms.

而如果我们讨论氯的话，在这个例子中两个氯的情况都是一样的，从七个价电子开始，然后减去六，因为每个氯原子周围,都有六个孤对电子。

麻省理工公开课 - 化学原理课程节选