So, today we're moving on, we're talking about Lewis structures.
那么，今天我们接着讲，继续讨论路易斯结构。
All right. So let's try one more example of drawing Lewis structures before we talk about formal charge.
好，让我们在讲形式电荷之前，再给一个例子画一下路易斯结构。
So, when we talked about Lewis structures, we actually assigned electrons to individual atoms or to individual bonds.
当我们讨论Lewis结构时，我们把每个电子指派到，各个原子或键上去。
So, these are the different ways that we can actually go ahead and use formal charge when we're choosing between different types of Lewis structures.
那么，这些就是在我们需要在,不同的路易斯结构之间做选择的时候,我们如何用形式电荷来进行判断的各种方法。
And I mean this means way past all the chemistry they've taken, they're now graduate students or they're now professors, and they're still writing out Lewis structures.
我想说的是这意味着尽管他们早就学完了所有的化学，他们现在都已经是研究生甚至是教授了，但他们依然在不断地写路易斯结构。
So now that we have enough practice drawing Lewis structures let's talk about actually figuring out this formal charge.
那么现在我们已经做了足够多的画路易斯结构的练习，让我们来讨论一下如何得出形式电荷。
So we'll talk specifically about drawing Lewis structures and then about formal charge and resonance, which are within Lewis structures.
因此我们会专门讲一讲，如何来画路易斯结构，然后再讨论形式电荷与共振论，它们也属于路易斯结构的范畴。
And the last thing we do for any of our structures to check them and figure out are these valid or not valid, are these good Lewis structures is to check the formal charge.
而为了检验任何一个结构是否有效，看它们是不是好的路易斯结构，我们要做的最后一件事就是检查形式电荷。
So in terms of remaining valence electrons we have 12, so we can finish off each of our Lewis structures, so that's our first structure there, and our second structure there.
那么关于剩下的价电子，我们有十二个，因此我们可以完成这两个路易斯结构了，那么这是我们的第一个结构，而那是我们的第二个结构。
So in terms of remaining valence electrons we have 12, so we can finish off each of our Lewis structures, so that's our first structure there, and our second structure there.
那么关于剩下的价电子，我们有十二个，因此我们可以完成这两个路易斯结构了，那么这是我们的第一个结构，而那是我们的第二个结构。
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