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They're not interacting at all so that's why the energy is the same as that for two individual atoms, that's what we're dealing with. As we get closer together, we start get lower and lower in energy.
它们之间没有任何相互作用，因此,体系的能量就等于两个分开的原子的能量，这就是我们要处理的，而随着我们的距离越来越近，我们的能量开始变得越来越低。
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I live in a house with two other girls that sits on one of the waterfalls here in town,
我和另外两个女孩住在一起，我们的房子就在镇上的一个瀑布旁边，
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It's as though we might think of there being two rooms-- to use a kind of analogy here.
这就好似我们可能会认为,存在两个房间,比方说
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So we know we always want to have our systems in as low an energy as possible, so it makes sense that a bond would happen any time we got a lower energy when we combine two atoms, versus when we keep them separate.
我们知道我们总是希望使我们的系统,处于能量尽可能低的状态，因此就应该有化学键产生,一旦我们合并两个原子之后体系的能量变得更低，相较于分开时。
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All right.Once we have them, we want to start making combinations out of them.
好，一旦有了这两个东西，我们就可以开始做他们的组合了。
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I really think by being an activist and putting pressure on that board that has done nothing really--I think eventually that will happen, hopefully Maybe we'll have one or two more questions Two more questions and then we'll wrap up.
我觉得通过做一个改革者该做的,以及对现在无能的管理层施加压力,真的--如果顺利的话那终将发生,差不多再可以提一两个问题,再提两个问题然后我们就结束。
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s Here you would have a 2s, here is a 2s, and when the two of them smear we end with something that looks like this.
这里一个2s，这里一个，当这两个发生拖尾时,我们就像这样结束它。
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We know there is no thing called a massless rope, but most ropes have a mass, but maybe negligible compared to the two blocks you are pulling, so we'll take the idealized limit where the mass of the rope is 0.
我们都知道无质量的绳子是不存在的,是绳子就有质量,但是相比于这两个物体就可以忽略不计了,所以我们有了这个理想的条件,即绳子的质量都是 0
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Yeah. I have two internships like I said. One is actually with our school TV station.
就像我说过的，我有两个实习。一个是在我们学校的电视台。
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who are like little brothers to me now and yeah, it's a great program,
他们对我来讲就像是两个小弟弟。我们的项目意义非凡，
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If an impure object--and you will see here these overlapping pairs, if you can imagine the lower pair sort of being plunked down on top of this pair, that will give you an idea of what we're trying to convey with this image.
如果一个不纯洁的东西--看这里，这些重叠的单词，假设这两个单词,突然跑到这两个的上面，这样你就会对我们这个图示想传达的内容有个概念。
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So let's reflect these two points.
那我们就把这两个点对称过去
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So here is where our question comes, because where do we put it?
这里我们的问题就来了，我们该把这两个电子放在哪里？
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So we actually only need two electrons to fill up the valence shell of hydrogen, remember that's because all we need to fill up is the 1 s.
我们其实只需要两个电子,就可以将氢的价壳层排满，要记得这是因为我们只需要排满，1，s，轨道。
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So I said that we want to be talking about valence electrons here, so that means if we're talking about, for example, the octet rule for an f f molecule where we have two fluorine atoms, we need to write the valence electrons as dots around them.
我说过我们在这要讨论的是价电子，这就意味着，如果我们要讨论，比如，关于两个氟原子组成的分子的八隅体规则,我们首先需要把价电子画成围绕在它们周围的点。
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Remember, every time we have two electrons that are being shared, that's a single bond.
还记得，每次我们有两个电子被共用，我们就有了一个单键。
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So, let's change our graph where we now have this zero point set as the two individuals hydrogen atoms, and then we see that our h 2 molecule is at the negative of the dissociation energy, or the negative what that bond strength is.
那么让我们把曲线图中的零点能改到,两个分离的氢原子处，那我们就会看到,氢分子就是负的离解能，或者负的键的强度。
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But since in drawing Lewis structures actually, in some cases you do, you can draw a dotted line that means a 1 and 1/2 bond, but most in most cases, we just draw out both resonance structures, and the way that we say it's a resonance structure is that we put it in the brackets and we put an arrow between it.
但是由于在画路易斯结构时,其实，在某些情况下是可以的，你可以画一条虚线来表示一又二分之一键，但是在多数情况下，我们就把两个结构都画出来，而我们说这是一个共振结构的表示的方法是,把它们放在括号里，并在中间放一个双箭头。
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B So we've got two candidates.
阶段的最后，End，of，B。,那我们就有了两个候选。
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