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We'll then take a turn to talking about the periodic table, we'll look at a bunch of periodic trends, including ionization energy, electron affinity, electronegativity and atomic radius.
然后我们再开始讲元素周期表，我们会看到很多周期性规律，比如电离能，电子亲和能，电负性以及原子半径。
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I put the new trends that are out. So you know,
我会把最新款的放在外面的位置。所以，
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And there's a lot we can explain by talking about what we see in the periodic table in terms of what different trends are in grouping different elements in different spots within the periodic table.
我们可以解释很多,通过讨论元素,周期表中的内容,按照各种不同的规律,将周期表中不同位置的元素分组归类。
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We're looking for trends. Obviously, if your aggregate score is 75, you're passed.But, 0 I'm looking at what's going on in the vicinity of 50 because I don't think my point scheme is that accurate.
很明显我们在寻找发展动态，如果你的总分是75分，你就通过了，但是，我在寻找50分左右的同学的发展动态0,因为我不认为我的分值安排是正确的。
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That's...these are trends that are unfolding rather than definite...that can be analyzed with any certainty at this point.
这些都是表面看来的趋势,并不是绝对的,从现在来看也难以下定论。
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just empirically speaking about the Harvard students, looking the trends and statistics-- empirically speaking, Americans are the most generous people in the world.
或只是说哈佛学生，根据发展趋势和统计，美国人是世界上最慷慨的人。
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They warn us of dangerous trends. They point out potent evils.
他们为我们警告对危险倾向，指出潜在的邪恶。
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So this is, in effect, the backdrop in which in the American academy--influenced, - as we'll now see, by certain trends in the British academy-- arose in the thirties and in the forties.
所以实际上,这就是当时美国学术界，受英国学术界影响-,在三四十年代崛起的背景。
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I'm very interested in trends,
我对流行很感兴趣。
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So, this means we have the general trends down, so we should be able to look at actual atoms in our periodic table and graph them and see that they match up with our trends.
那么，这表示我们已经知道了大体的规律，现在我们可以来看看周期表中的,原子的实际情况，并把它们画出来,看看是否与我们的规律相符。
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You just need to remember what's happening to z effective, which really tells us what's happening with all the trends, and once you know z effective, you can figure out, for example, what direction the atomic radius should be going into.
你只需要记住有效核电量的规律，实际上它会告诉我们所有的规律，只要你知道了有效核电量的规律，你就可以判断，比如，原子半径会向着哪个方向发展。
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So this, in fact, is going to be our last principle that we're going to talk about in terms of periodic trends.
实际上，这将是,我们要讨论的最后一个,周期性规律。
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So, we can think about trends in electron affinity just like we did for ionization energy, and what we see is a similar trend.
那么，我们可以想一想电子亲和能的,周期性规律是怎样的，就像我们刚才分析电离能那样。
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But you actually need to keep a few caveats in mind as you do this, which is the fact that trends predict a lot of chemical properties, but they can't predict everything in terms of biological properties.
不过在你使用的过程中,需要牢记一些注意事项,那就是元素周期律可以预言很多化学性质，但是不能预言一切性质,比如生物学性质。
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As I told you, on the first day, I do look at trends.
我告诉你，第一天开始我看重的是趋势。
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So anyway, when we talk about periodic trends, it doesn't always match up.
无论如何，当我们讨论元素周期律时，要知道它并不是总能与实际情况相符。
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