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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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Periodic Table, Table of Constants, and you are allowed an aid sheet, an 8-1/2 by 11 sheet of paper.
元素周期表，常数表，你允许带帮助表格，一个8-1/2乘11的纸。
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So you should be able to look at your periodic table and see this, or also I've written the trend here.
大家应该能够通过查周期表，或者通过看我写在这里的趋势看出来。
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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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Relative to the whole market, It's well known that over periods of multiple decades the market has a tendency to go up.
是和整个市场相关的对吗，我们都知道经过几十年的时间周期,市场会有上涨的倾向。
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You've got to ask yourself, let the time it takes to do a full circle, that's the time period, do a full circle.
你已经问你自己了,留足够的时间让它运动一整圈,那就是运动整个圆周的时间周期
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5% And, it turns out that about 75% of the periodic table falls into this category.
而且，它表明元素周期表的,都属于这个种类。
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You are allowed to use on the test the official version of the Periodic Table of the Elements which most of you should have by now.
在测试中你们可以使用,化学元素周期表的官方版本,你们应该大部分都有了吧。
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If you look on the Periodic Table this is 598 atomic hydrogen. And, sure enough, there is 13.598, which is this number here in electron volts.
如果你查找元素周期表上的氢原子,毫无疑问，它的电离能就是13。,这个数值也是电子伏的值。
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So hopefully, it was a time issue in terms of looking at the periodic table, because let's have you tell me what are we looking for here?
希望刚才大家出问题的原因,是因为看周期表有时间限制，请大家告诉我,我们在这里找什么？
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It is just down the hall from this lecture theater. And you bring the Periodic Table and the Table of Constants and a calculator and something to write with.
就在这件教室下面的大厅那,你们带上元素周期表和常数表,还有一个计算器和一些写的东西。
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Cells can stop in their lifetime at some point in the cell cycle and persist for long periods of time.
细胞生命期可以停止在细胞周期的某个点,并保持很长时间
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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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And I don't actually know the periodic table entry for raisins. So I'll have to write it out.
我不知道葡萄干的周期表条目是什么,所以现在我要把它写出来。
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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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And this is the same periodic table that you're going to get in your exams, so it's good to practice doing your problem-sets with that periodic table so you're not relying on having the double check right there of seeing what the electron configuration is.
这也是你们考试时会用到的相同的表,这样你们就不会，所以使用周期表来做问题集,是很好的练习,这样你们就,不会依赖于再次确认,电子构型是什么了。
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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, instead of having the periodic variation of water, or the periodic variation of air density here we're talking about an electric field.
不像水或者空气密度的,周期变化，我们这里,讨论的是电场。
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So as we go across the row, and this is my beautiful picture of a periodic table here.
那么当我们沿着行向右走的时候，这是我漂亮的元素周期表。
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And we know as we go across a row in the periodic table, what's happening is that z effective or the effective pull on the nucleus is increasing.
而我们知道沿着周期表的某一行向右看，有效核电量,或者说原子核的有效引力是在逐渐增大的。
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Versus looking at, for example, helium or neon or argon, these are all inert gases, inert meaning essentially do not react, those were grouped together in the periodic table.
相反，他发现氦，氖，氩，都是惰性气体，惰性的意思是基本不参与化学反应，因此把它们放在周期表中的同一类里。
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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 similarly, as we now move up only one more atom in the table, 3 so to an atomic number of three or lithium, now we're going from six variables all the way to nine variables.
类似地就像我们现在,移动到周期表中仅仅多一个电子的情况，移动到一个原子数为，或者锂元素,现在我们从6个变量到了9个变量。
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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 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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The period of table's on the back page of your notes if you don't see that there.
元素周期表在你们讲义的封底,如果你没看到的话。
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The one problem that we run into is as we go to more and more atoms on the table, as we add on electrons, the Schrodinger equation is going to get more complicated.
我们将会遇到的一个问题,是当我们处理周期表中越来越多的原子时，当我们增加了电子，薛定谔方程,变得愈加复杂。
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So it looks like not too many more than half of you got this correct, so make sure you can look at your periodic table and figure out how to think about ionization energy in terms of z effective, not just in terms of memorizing what that trend is.
看起来只有一半多一点的人,做对了，所以请大家务必做到能够通过观察周期表,并在考虑电离能时,从有效核电量的观点出发，而不是仅仅依靠记住这个规律。
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