Cape Town, on the south Atlantic coast, boasts a new 70,000-seat stadium with backdrops of the apartheid-era prison at Robben Island on one side and its iconic Table Mount on the other.
VOA: standard.2010.06.02
So if you flip the info page over on the back here, what you'll see is the periodic table, this is the same one that I've handed out in the last two lectures - the periodic table without any electron configurations.
将这张纸翻过来,你可以看到一个元素周期表,这与我们前两次课发过的,是一样的,-没有任何电子排布的周期表。
And no one's even put water on our table.
甚至都没有人给我们倒杯水。
If you look up in the corner of your Periodic Table on one of the sides, they have actually tabulated this for you.
你认真看一下角落上,在一个角落,应该已经为你们把数据列成表了。
The one problem that we run into is as we go to more and more atoms on the table, as we add on electrons, the Schrodinger equation is going to get more complicated.
我们将会遇到的一个问题,是当我们处理周期表中越来越多的原子时,当我们增加了电子,薛定谔方程,变得愈加复杂。
Imagine I have a little lamp, a little goose- one of those little gooseneck lamps, I'd put it on the table here, I'd put the height about a f-- about a foot off the table. And if I was really good, - I could hit, or time it so that when I hurt- yeah, try again. When I turn this on switch on in the lamp, at exactly the same time, I'm going to hit a key on my computer and start it running.
想象下我有一个那种小雁颈台灯-,我把它放在桌子上,大概离桌子,有一英尺那么高吧,这样挺好的,我可以打开-,或者关闭这灯,并在这同时,我可以让我电脑,开始运行。
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.
如果你看元素周期表,你会在这一侧发现,这是原子化焓。
And that's all that's big enough to pass through or small enough to pass through. And if we go up even just one row on the periodic table to potassium, what we actually see is now that it's going to be too large, and, in fact, a potassium solvated with one water molecule won't go through our channel.
就是这样刚好大到它通过,或者说刚好小到它通过,即使我们再沿着周期表往下走仅仅一行到钾离子,我们看到的就将是它的个头太大了,实际上,溶解于一个水分子的单个钾离子,不能穿过我们的通道。
The only thing that's different is that they're one down on the periodic table, potassium is down one row, so it's going to be a little bigger, but when we're thinking about size, it maybe does not seem that significant to talk about the size.
它们唯一的不同点,就在于其中一个在周期表的下面,钾在下一行,因此它要稍微大一些,但是当我们考虑尺寸的时候,似乎讨论尺寸的意义不大。
应用推荐