And in contrast, in the lower left hand part of the periodic table, these 2 quantities are low, so also what we're going to see is low electronegativity.

相反地，在周期表的左下部分，这两个量的值都很小，因此我们会看到这里的电负性也很低。

麻省理工公开课 - 化学原理课程节选

Depending on what kind of chemistry you go in to, you might accidentally memorize parts of the table, which is fine, but what you really want to know how to do is know how to use the periodic table.

取决于你今后从事哪个方向的化学研究，你可能会不经意地记住周期表的某一部分，这就够了，但是要注意,你真正需要知道的是如何使用元素周期表。

麻省理工公开课 - 化学原理课程节选

And so here is the Periodic Table in its glory today following on Mendeleev's scheme.

所以，这是周期表,今天非常光荣地跟在门捷列夫的图表之后。

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If cells were actively proliferating, that is you had a population of cells that are actively proliferating, they would be going through continuous rounds of the cell cycle.

如果细胞处在活跃增殖状态,就是说有一定数量的,细胞具有增殖活性,它们就会连续地经历细胞周期的各个阶段

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So specifically, what we're asking here is as we go across the periodic table, we want to consider which has the smaller ionization energy.

具体地说，我们这里要问的是,从周期表来看，你认为,哪一个元素的电离能更低。

麻省理工公开课 - 化学原理课程节选

So similarly, as we now move up only one more atom in the table, 3 so to an atomic number of three or lithium, now we're going from six variables all the way to nine variables.

类似地就像我们现在,移动到周期表中仅仅多一个电子的情况，移动到一个原子数为，或者锂元素,现在我们从6个变量到了9个变量。

麻省理工公开课 - 化学原理课程节选

And after the periodic table was developed in the late 1800's, people didn't understand this quite as well, they took things a little more literally.

在十九世纪后期元素周期表经过发展之后，人们还没有很好地意识到这一点，他们的认识还有些粗浅。

麻省理工公开课 - 化学原理课程节选

Similarly we see as we go down the table, so as we're going from one row to the next row, so, for example, between helium and lithium, we see a drop; the same with neon to sodium, we see a drop here.

同样地，我们来看看沿着周期表往下走，当我们从一行到下一行时，比如，从氦到锂，我们看到了一个下落;,从氖到钠也一样，我们看到这里有个下落。

麻省理工公开课 - 化学原理课程节选

Often what you'll see is not a table based on this definition, but something that's called the Pauling definition of electronegativity, but it's exactly the same idea and the same trend as this more numerical way to think about what the meaning of electronegativity is.

通常你看到的表格一般都不是基于这种定义的，而是基于,鲍林定义的电负性，但在意义上是相同的，并且满足同样的周期性规律,当和这种这种更数值化地理解电负性的定义,作对比时。

麻省理工公开课 - 化学原理课程节选