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People who remember the periodic table of the elements from chemistry class might recognize them.
VOA: special.2010.10.08
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And en route we discovered that we can divide the Periodic Table into metals, 75% which is about 75% of the Periodic Table.
我们发现,我们能够将元素周期表划出金属，大概占。
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If you click on Courseware you will get to this menu, the first of which preferences is Periodic Table.
如果你点击课件，就会来到这个菜单，第一个选择就是周期表。
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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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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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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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A remember about the Periodic Table test which will be added next week on the 23rd.
我要提醒你们,下周23号将会有个周期表测试。
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So, remember when you're looking at your periodic table, don't forget about the lanthanides, sometimes they come into play.
因此，要记住，当你在看元素周期表时，不要忘了镧系元素，有时候也会用到它们。
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Well, if we look on the chart, the first ionization energy is what is reported in your Periodic Table.
如果我们查阅图表，一级电离能,已经在元素周期表上标示了。
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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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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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We can get this from the Periodic Table, so reported is Periodic Table.
我们能从元素周期表中得到这个，所以接下来要讲元素周期表。
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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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So, if we look on the periodic table, comparing, for example, s to o, if we have s it's below o, what happens to ionization energy as we go down a table?
那么，如果我们看周期表上，比较，比如，硫和氧，硫在氧下面，当我们沿着表向下看的时候,电离能是怎么变化的？
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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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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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Depending on what kind of chemistry you go in to, you might accidentally memorize parts of the table, which is fine, but what you really want to know how to do is know how to use the periodic table.
取决于你今后从事哪个方向的化学研究，你可能会不经意地记住周期表的某一部分，这就够了，但是要注意,你真正需要知道的是如何使用元素周期表。
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So as we go down we're now adding electrons to further and further away shells, so what we're going to see is that the atomic radius is going to increase as we're going down the periodic table.
当我们向下走时,我们会将电子加在越来越远的壳层上，因此我们将看到原子半径,将随我们沿周期表向下走而增大。
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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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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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So, here we have a picture of Dmitri Mendeleev, who is one of the scientists responsible for first compiling the periodic table.
这是一张德米特里？门捷列夫的画像，他是最早制作,元素周期表的科学家之一。
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See, if you know the Periodic Table then you know where elements are relative to one another.
如果你足够熟悉元素周期表,你可以知道,任何元素与另外元素的关系。
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We need to add something else in order to explain what is going on in the Periodic Table.
我们需要引其他一些东西进来才能解释清楚,元素周期表中发生的这种现象。
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So, then all we need to do to determine which elements that corresponds to is take a look at our periodic table.
因此，我们需要做的只剩下,在元素周期表中寻找,对应的元素有哪些。
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So specifically, what we're asking here is as we go across the periodic table, we want to consider which has the smaller ionization energy.
具体地说，我们这里要问的是,从周期表来看，你认为,哪一个元素的电离能更低。
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I thought, well, maybe we can now go to the Periodic Table and figure out what is going on there.
那么接下来，我们可以讲元素周期表了吧,让我们看一下在这儿我们又会遇到什么问题。
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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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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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