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if we think about electronegativity as a periodic trend we can just draw our nice periodic table here, and let's separate it into quadrants.
如果我们来思考一下电负性的周期性规律,我们可以把我们漂亮的周期表画在这，然后把它分成四个象限。
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We have a table of the elements with properties varying periodically with atomic mass, so we compress all of that information and refer to it as the Periodic Table.
我们有一个元素表，其中的元素的特性,随着原子质量的改变而引起周期性的变化，所以我们将所有的信息精简,将它变成一个周期表。
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sort of takes the cyclicality out of earnings and you can see over history how that multiple has varied.
一定程度上在收益上避免了周期性的,而且你可以看到随着历史的进程,这个倍数发生了多大的变化。
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Here is as pacemaker and this pacemaker does the same thing that a heart pacemaker does, it generates periodic electrical signals.
它和心脏起搏器发挥的作用相似,发出周期性的电信号
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And what we've been talking about with all of these properties are, of course, how can we figure out what that is for a certain atom by looking at the periodic table, so we want to think about the periodic trend for atomic radius.
对于我们讲过的这些性质，我们所讨论的一直都是,当然是，我们如何能够判断某一个原子的这些性质,通过观察周期表，因此我们需要思考一下原子半径的周期性规律。
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It decreases. If you're still not completely up on the periodic trends, that is stuff that's going to be on the first exam, so make sure that you're able to do this without taking too much time to think about it.
它会降低，如果你还没有完全掌握周期性规律，而这是第一次考试要求的内容，因此请务必做到不用,想太久就能做到这点。
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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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I don't think the housing industry, in general,is a good place to be because of its, sometimes,violent cyclicality.
我认为总的来说住房工业,不是一个好的投资品种,因为它时常有着强烈的周期性
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You can keep people alive for many decades with periodic dialysis to remove waste products from the blood.
通过周期性的透析除去血液中的代谢废物,可以使病人寿命延长几十年
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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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And we talked about periodicity and properties, so let's go and take a look at what we have and see if we can reconcile this.
现在我们讲一下周期性，我们先看一下我们已经掌握的知识,看看能不能和我们要讲的达成一致。
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So let's turn our attention to a new topic, which is thinking a little bit about the periodic table, and also talking about periodic trends.
我们的新主题上，我们将会讨论一点关于元素周期表的知识，同时也会讲一讲周期性规律。
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And the glitch that doesn't make sense just through periodic trends, is that it turns out that the ionization energy of boron is actually less than the ionization energy up beryllium.
仅仅考虑周期性规律,是无法理解这个问题的，这里显示硼的电离能,实际上比铍的要小。
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Often what you'll see is not a table based on this definition, but something that's called the Pauling definition of electronegativity, but it's exactly the same idea and the same trend as this more numerical way to think about what the meaning of electronegativity is.
通常你看到的表格一般都不是基于这种定义的，而是基于,鲍林定义的电负性，但在意义上是相同的，并且满足同样的周期性规律,当和这种这种更数值化地理解电负性的定义,作对比时。
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This is about the periodic trends that we discussed on Wednesday.
这是关于我们在周三讲过的,周期性规律的。
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that's our topic here, we're talking about periodic trends.
这是我们的主题，我们要讨论周期性规律。
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So that is where the "periodic" comes from.
这就是存在周期性的原因。
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The problem with private banks issuing notes is that there would periodically be banking crises when the banks failed to pay on their notes and they couldn't pay out the gold that was demanded--that was required.
私有银行发行纸币的问题在于,当它们没法用要求的金子-规定的金子数量,支付它们发行的纸币时,它们将周期性的,陷入银行业危机。
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