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The atmosphere is about twenty-percent oxygen and eighty percent nitrogen from Earth's surface to where space begins at one-hundred-twenty kilometers up.
VOA: special.2011.04.06
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So, we can put our sulfur in the middle, and then it doesn't really matter how we draw the rest of it, where we put our c l's versus where we put our oxygen.
那么，我们可以把硫放在中间，然后把其它的原子画在哪里就不重要了，把两个氯原子与一个氧原子放在哪里都行。
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We could also, I think, well, maybe this isn't written out in terms of that convention, which sometimes it's not, so let's also try writing it, such that we have the hydrogen and the oxygen atom there.
我们也可以，我想，好吧，还有可能它不是按照惯例写的，有时候会出现这样的情况，因此，让我们把氢原子和,氧原子成键的情况也写出来。
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Experts say use of cigarettes and alcoholic liquids also reduces the body's ability to use oxygen.
VOA: special.2009.07.14
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So then, I could say that the average valence electron energy for oxygen would then be, I've got two s electrons.
所以，我可以说,氧的平均价电子能,就是，以我得到的两个s轨道的电子来算。
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It carried oxygen,water, electricity and food for two men for two days on the moon's surface.
VOA: special.2009.07.22
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This is exactly where I don't really know the details, but I take it it's something like: because of whatever the original input was, eventually the blood's no longer circulating and oxygen isn't making its way around the body.
事实上我对这方面不是很了解,我只能认为是,不论最初的死亡原因是什么,最后血液不再流动,氧气不能输送到全身
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Scientists say enough oxygen remains in a person's system for several minutes after breathing stops.
VOA: special.2009.06.09
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So, in this case, we see that our formal charge is negative on the nitrogen, in this case it's negative on oxygen.
那么，在这种情况下，我们看到氮的形式电荷是负的，而在这种情况下，氧的是负的。
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So, for instance, this would suggest to us by the way it's written that the hydrogen is attached to the nitrogen and not the oxygen.
因此，比如，这样的写法会提醒我们,这个氢原子是与氮原子成键的，而不是氧。
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So, this one can be tricky because oxygen looks like it's in the middle because of the way it's written, but we need to start by looking at the lowest ionization energy.
这个例子可能有些狡猾,因为氧看起来是在中间的,因为它是这样写的，但是我们需要从寻找最低的电离能开始。
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An example of that might be, oh, let's look at something like oxygen.
一个例子可以是，嗯，对，我们看下氧原子。
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It's easy to write the skeletal structure, because it's all oxygen, we don't have to worry about what's going to go in the middle.
画它的骨架结构很容易，因为它们都是氧原子，我们不需要担心哪个原子在中间的问题。
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So let's think about water here as our simplest example with oxygen.
让我们讨论,对于氧来说最简单的例子-水。
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And, let's try oxygen.
我们看氧。
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So it's going to be a sigma bond, 1s and we have oxygen 2 s p 3 and hydrogen 1 s.
它是sigma键，我们有氧2sp3和氢。
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So let's switch to thinking about oxygen hybridization here.
让我们考虑一下氧的杂化。
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So, we can say that -- if we have neon here and we want to think about what's isoelectronic, -- f minus would be isoelectronic. We also have oxygen -- what would the charge on oxygen be? Um-hmm, right. 2 minus.
那么，我们可以说--如果我们这里有氖原子,而我们想知道与它等电子的是什么，负一价的氟离子就是与它等电子的，我们还有氧-,氧应该是几价的？没错，负二价。
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Here's a data set. There is oxygen.
这儿是一个数据集，那是氧。
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So now let's look at an example where we talk about using these 2 p z orbitals, so let's look at oxygen.
现在让我们来看一个要,用到2pz轨道的例子，让我们来看一下氧。
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So, let's just arbitrarily put it between these two in this case here, but actually there's no reason we couldn't also put it between oxygen b and c, so I'm going to draw another structure where we have it here.
那么，让我们任意地将它们放在这两个之间，但实际上我们没有理由,不能把它们放在氧原子，B，与，C，之间，因此我将把另外一个结构画在这里。
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Well, if you look, sulfur is less than chlorine, which is less than oxygen.
会发现S的比Cl的要低，比O也低。
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There's absolutely nothing that tells us which atoms we should put it between, because they're both oxygen-oxygen.
我们没有任何理由把它们,放在其中一对原子中间，因为它们都是氧氧键。
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By looking at the periodic table it's right underneath oxygen, so those both have 6 valence electrons.
通过查周期表可以看到它就在氧的正下方，因此它们两个都有六个价电子。
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So if we're talking about oxygen, 2s2 we would say that it's 1 s 2, then we have 2 s 2, 2p and then we have 2 p, and our total number of electrons 4 in the p orbitals are four.
所以如果我们在讨论氧，我们会说它是1s2然后我们有，然后，我们在p轨道的,电子总数是。
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