这能解释为什么它在元素周期表中缺失了吗？
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.
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.
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.
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.
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.
扩展元素周期表的比赛仍在继续。
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。
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.
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.
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.
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).
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.
他们支持他们同胞门捷列夫(他创造了元素周期表的第一版)有130年历史的观点。
They support the 130-year-old idea of their countryman Dmitri Mendeleev (who created the first version of the periodic table of elements).
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.
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。
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.
自一位在自己一根头发上刻下元素周期表的化学家之后，米罗·诺夫是我最喜欢的疯狂科学家。
Mironov may be my favorite mad scientist since the chemist who had the periodic table engraved on one of his hairs.
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.
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.
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.
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