Early versions of the periodic table had gaps, missing elements.
早期的元素周期表有空缺，缺少一些元素。
Of course, it was an element the periodic table let us to expect existed before anyone had found it or made it.
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。
Professor Harrison, were you saying that the periodic table is predictive?
哈里森教授，你是在说周期表是可以预测的吗？
In fact, subsequent work has shown that in a periodic table, elements should not be ordered strictly by atomic mass.
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。
Does that explain why it was missing in the periodic table?
这能解释为什么它在元素周期表中缺失了吗？
For example, tellurium comes before iodine in the periodic table, even though its atomic mass is slightly greater.
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。
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。
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。
Alchemy, or transmutation, has placed new elements on the periodic table, including plutonium.
炼金术，或嬗变，已经在元素周期表中增加了新元素，包括钚。
Arsenic sits right beneath phosphorus in the periodic table of the elements and shares many of its chemical properties.
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。
"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。”
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。
The next heaviest element in the periodic table, the inert gas helium, is used for detecting cracks in pressure vessels and the like.
而在周期表里此行最重的元素，惰性气体氦，用于压力舱那类东西的小裂缝。
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。
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。
Mythological characters that can be found on the periodic table include Tantalus (Tantalum, ta) and his daughter Niobe (Niobium, Nb), and Promethius (Promethium, Pm).
元素表中可以找到神话中的角色，比如坦塔罗斯(钽)和他的女儿尼俄伯(铌)，还有普罗米修斯(钷)。
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。
It is on the periodic table of elements under the symbol Bi at atomic number 83.
在元素周期表里序列号是83，标志是BI。
As an example, consider the periodic table expressed in XML.
比如，考虑一下用XML表示的元素周期表。
That is an extraordinary finding, and it prompts the question of whether previously unsuspected battery materials might be lurking at the heavier end of the periodic table.
这是个非同凡响的发现，这个发现也提出了一个问题。是否还有以前没想到的，潜伏在元素周期表末端的电池材料？
She gave him a miniature copy of the periodic table of elements.
她给了奥巴马一个元素周期表的微型复制品。
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。
The chemistry of the Earth was out of kilter, wholly unbalanced by the periodic table, and alive.
以化学元素表来衡量，地球的化学性质是不正常的，完全失去了平衡，却充满活力。
And yet, on the fourth or fifth reading in the 24 years since UK publication, the Periodic Table still seems to me to be the nearest match to the ideal science book.
这本书第一次在英国出版是在24年前。然而，当我第四遍或者是第五遍再读这本书时，我仍然觉得《周期表》是我心目中最理想的科学书籍。
And I put a periodic table up there, just the part you might need to look at.
我在上面放了一张周期表，只放了可能要用到的一部分。
When Dmitri Mendeleev devised his periodic table in 1869, it contained 63 elements; a similar chart in a chemistry classroom now has up to 118 entries.
门捷列夫于1869年制定周期表时，表中包含63个元素，而现在化学课堂中一个类似的图表元素已多达118个。
Boffins were busily filling in the blanks in the periodic table and probing unknown atomic phenomena (like radioactivity and bonding).
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)。
Suppose you want to format this code as a typical cell of a periodic table, as Figure 1 shows.
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。
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。
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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