In places, the water table is declining at a rate of a meter a year, necessitating the periodic deepening of wells and the use of ever-more-powerful pumps.
在一些地方，水位正以每年一米的速度下降，需要定期加深井并使用更强大的水泵。
So is my version of the periodic table wrong?
那么我的元素周期表是错的吗？
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？
The structure of the periodic table appeared to limit the number of possible elements.
元素周期表的结构似乎限制了潜在元素的数量。
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。
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。
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。
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。
"The whole periodic table is churning in there," Sims said.
“周期表的所有元素都存在于这锅熔岩汤中，”西姆斯说。
The six noble gases are found in the far right column of the periodic table.
六种稀有气体在元素周期表的最右侧。
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。
You will be asked to write down the periodic table.
你需要默写周期表。
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。
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。
You will never in this class have to memorize anything about the periodic table.
这门课并不要求大家去背元素周期表，一点都不要求。
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。
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。
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。
But still, he was able to put together a periodic table.
他依然能够将元素周期表制作出来。
But still, he was able to put together a periodic table.
他依然能够将元素周期表制作出来。
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