早期的元素周期表有空缺，缺少一些元素。
Early versions of the periodic table had gaps, missing elements.
这能解释为什么它在元素周期表中缺失了吗？
哈里森教授，你是在说周期表是可以预测的吗？
Professor Harrison, were you saying that the periodic table is predictive?
沿着周期表的对角线的中间有大约包含六个元素的元素组。
There is this group of about half a dozen right down the diagonal middle of the periodic chart.
例如在元素周期表中，碲排在碘之前，尽管它的原子质量略大一些。
For example, tellurium comes before iodine in the periodic table, even though its atomic mass is slightly greater.
当然，它在被人发现或制造前，就是一种元素周期表使得我们期待其存在的元素。
Of course, it was an element the periodic table let us to expect existed before anyone had found it or made it.
事实上，后来的研究已经证明，在元素周期表中，元素不应该严格按照原子质量来排序。
In fact, subsequent work has shown that in a periodic table, elements should not be ordered strictly by atomic mass.
比如，考虑一下用XML表示的元素周期表。
As an example, consider the periodic table expressed in XML.
她给了奥巴马一个元素周期表的微型复制品。
She gave him a miniature copy of the periodic table of elements.
经过3年的研究，元素周期表上又增添了2种元素。
Two new elements have been added to the periodic table after a three-year review by the governing bodies of chemistry and physics.
它们是黑色的,中间还有些元素周期表上的彩色元素。
我在上面放了一张周期表，只放了可能要用到的一部分。
And I put a periodic table up there, just the part you might need to look at.
如果你看元素周期表，你会在这一侧发现，这是原子化焓。
Anyway, if you go to your Periodic Table you will find that on the one side you can get what is called the enthalpy of atomization.
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。
So as we go across the row, and this is my beautiful picture of a periodic table here.
炼金术，或嬗变，已经在元素周期表中增加了新元素，包括钚。
Alchemy, or transmutation, has placed new elements on the periodic table, including plutonium.
假设要将这段代码格式化成周期表中的典型单元格，如图1所示。
Suppose you want to format this code as a typical cell of a periodic table, as Figure 1 shows.
《周期表的故事：元素的奇特经历》休•奥尔德-威廉姆斯著。
Periodic Tales: The Curious Lives of the Elements. By Hugh Aldersey-Williams.
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。
So you should be able to look at your periodic table and see this, or also I've written the trend here.
我不会只把周期表和十四行诗对应，因为他写的是十四行诗。
And, I mean, I wouldn't just give it to him because he wrote a sonnet.
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。
If you click on Courseware you will get to this menu, the first of which preferences is 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。
We need to add something else in order to explain what is going on in the Periodic Table.
锂是元素周期表第三“轻”的元素，这使得锂具备更高的能量密度。
Lithium is the third-lightest element on the periodic table, which allows for far greater energy density.
在元素周期表中，砷就位于磷的下面，二者具有很多相同的化学性质。
Arsenic sits right beneath phosphorus in the periodic table of the elements and shares many of its chemical properties.
科学家们忙于填补元素周期表的空白、探索未知的原子现象(如放射性和键合)。
Boffins were busily filling in the blanks in the periodic table and probing unknown atomic phenomena (like radioactivity and bonding).
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。
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.
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。
So, remember when you're looking at your periodic table, don't forget about the lanthanides, sometimes they come into play.
如果你看周期表的下面部分,到109号，你会看到这些奇怪的符号,这些是什么呢？
If you do look down at the Periodic Table and get above 109, Uun Uuu Uub you will see these strange notations here, Uun,Uuu,Uub What is all of this?
但这位语速飞快的工业奇才已经翻遍了元素周期表，也找不出一种比钯更安全的替代元素。
And the fast-talking industrialist has exhausted the rest of the periodic table looking for an element that is a safer power source than palladium.
但这位语速飞快的工业奇才已经翻遍了元素周期表，也找不出一种比钯更安全的替代元素。
And the fast-talking industrialist has exhausted the rest of the periodic table looking for an element that is a safer power source than palladium.
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