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?
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.
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.
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.
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.
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.
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.
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.
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.
通过查周期表可以看到它就在氧的正下方，因此它们两个都有六个价电子。
By looking at the periodic table it's right underneath oxygen, so those both have 6 valence electrons.
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.
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.
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。
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.
就像化学上的元素周期表，该系统拥有充足的机会来进行混合，创造合金，或添加混合物质。
Like the Periodic Table of the Elements, this system holds ample opportunity for mixing proportions, creating alloys, and adding impurities.
这项研究是新生物学的起点，正像元素周期表界定了化学范围一样，它将界定生物学的范围。
That would be the starting point for a new sort of biology, one in which the scope of the problem was defined in the way that the scope of chemistry is defined by the periodictable.
Karol说，在过去250年里，平均每2.5年就有一个新元素被添加进元素周期表。
Over the past 250 years, new elements have been added about once every 2.5 years on average, Karol said.
而说到实物，再没有比元素周期表79号元素更实在的物质了——一个金融风暴里最受欢迎的避风港。
In a world of unreal investments, reality must finally have its day, and there is nothing more real than periodic-table element No. 79 — favored shelter from the financial storm.
新元素目前尚未被命名，放入元素周期表的116号和118号元素之间的位置，这两者都已经被发现。
The new element, which has yet to be named, slips into a place on the periodic table between elements 116 and 118, both of which have already been discovered.
还对他说：“这是个元素周期表，你可以放到钱包里，以防需要计算分子质量，你又想不起来的尴尬场面。”
"In case you're ever in a bind and need to calculate a molecular weight, here's a periodic table for your wallet," she told him.
还对他说：“这是个元素周期表，你可以放到钱包里，以防需要计算分子质量，你又想不起来的尴尬场面。”
"In case you're ever in a bind and need to calculate a molecular weight, here's a periodic table for your wallet," she told him.
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