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So, why don't you go ahead and take 10 more seconds on this second clicker question for our intro.
请大家再花十秒钟的时间,来做一下第二个选择题。
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All right. It's 12:05, so why don't you go ahead and take 10 more seconds on the clicker question today.
好，现在已经，12：05，了，请大家,花十秒钟的时间做一下今天的选择题吧。
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I left out the noble gases here because they do something a little bit special, and actually, I'm going to give you one last clicker question today to see if you can tell me what you think noble gases do.
我并没有把稀有气体算在里面,因为它们的电子亲和能有点特别，实际上，我将会把这作为今天的,最后一个选择题，来请大家告诉我,你们觉得稀有气体电子亲和能应该是怎样的。
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As you're settling into your seats, why don't we take 10 more seconds on the clicker question here.
你们现在都坐在座位上了，为什么不用10多秒的时间,来做这道选择题呢？好的。
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So let's do a quick clicker question, and you tell me how many valence electrons does fluorine have? Remember, valence electrons are different from core, they're only the outer-most electrons in the outer-most shell.
那么让我们来做一个小选择题，请大家来告诉我,氟有多少个价电子，要记得，价电子与芯电子不同，它们是在最外壳层的最靠外面的电子。
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So, let's make sure everyone kind of has this down, let's do another clicker question here.
好，让我们确保每个人都记下了这点，来做下一个选择题吧。
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Can you go ahead and take 10 more seconds on this first clicker question here? OK.
大家先来花十秒钟的时间,把第一个选择题做了好吗？好。
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So we've tagged each of your numbers to your actual recitation, so we can see today which recitation actually is going to be doing the best in terms of clicker questions, who's going to get the most correct today.
我们已经将你们的学号,与你们参加的习题讨论小组关联起来了，这样通过回答选择题,我们就可以来比一比，哪个小组答对的人最多。
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We're actually going to do one more clicker question to get started with today, and as we do, I'll explain something we're going to be trying today, which is a little bit of a friendly competition in terms of answering the clicker questions correctly.
我们将在开始讲授今天的课程之前,再多做一个选择题，我先来说明一下做这件事的原因，这实际上是一个,回答选择题的小比赛。
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So, let's do a clicker question on isoelectronic atoms.
那么，让我们来做一个关于等电子原子的选择题吧。
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Could everyone take 10 more seconds on the clicker question.
请大家先花十秒钟的时间,来做一下这个选择题好吗？
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So we have extra incentive to get these clicker questions right.
所以，大家应该更有动力,把这些选择题答对。
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OK, great. Good job on the clicker questions today.
好的，非常好，今天的选择题都做得太好了。
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So, let's turn to another clicker question here.
那么，让我们进入下一个选择题的环节。
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So let's go to a clicker question.
那么让我们来做一个选择题。
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And as a reminder, hopefully I don't need to remind any of you, but exam 1 is on Wednesday, so rather than our clicker question being on something from last class, which is exam 2 material, let's just make sure everyone remembers some small topic from exam 1 material, which is the idea of angular nodes.
而作为一个提醒--我希望大家都不需要提醒，但是这周三就要进行第一次考试了，因此我们的这个选择题,不是关于上节课内容的，那是第二次考试的内容，这里只是想确认大家都记得,第一次考试所要求的一些小问题，也就是关于角向节点的概念。
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