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It's what it's called when an atom takes both electrons in the bond.
这就是它为什么叫这个名字,当一个原子从成键中得到两个电子。
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So, ownership of stocks absolutely crushes buying bonds -almost 16,000 times your money or more than 3,000 times your money in the stock market as opposed to 72 times your money or 19 times your money in the bond market or the bill market.
股票的收益率远远超过债券,小盘股的收益差不多16000倍于本金,而大盘收益也翻了300倍以上,相比长期债券的72倍,和短期债券的19倍
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In contrast, the dissociation energy of a bond for hydrogen, and molecular hydrogen is everywhere around us, we see 432 kilojoules per mole.
相反，氢分子在我们周围到处都是，一个氢分子的离解能，是432千焦每摩尔。
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so you can see that there is going to be two sets in antibonding, three sets in bonding for a net of one, giving us the single bond.
因此你能看到,反键轨道上有两组，三组成键，得到一组净成键，所以成的是单键。
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Socrates, in other words, has broken the bond of tradition and traditional authority that holds the ancient city and the ancient family together.
苏格拉底，其实已经摧毁了,传统与传统权威间的联系,那可是维系古代城邦,与古代家庭的力量。
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And the activation in another area of the brain, the interna insula that would help us to put the oppisite choice of the bond running away from risk.
而大脑中另一区域的活动，即岛叶内部活动，可以帮助我们作出相反决策,即选择“债券“来远离风险。
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Let's re-draw this, so it looks a little bit neater, where we have a triple bond in the middle instead, and again, we need our negative 1 charge there.
让我们重写这个，这样看起来更整洁一点，我们有一个三键在中间，同样地，我们这里需要一个负电荷。
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So there's not a lot of room in the government bond market or other high-quality bond markets to generate excess returns.
所以对于政府债券或者优质债券,超额收益的空间不大
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It's much more relevant to set our zero point energy as the separation of a bond in terms of talking about the reactions that we'll usually be dealing with here.
更好的是把零点能定在,键断裂的时刻,在讨论化学反应的时候,而我们以后将经常遇到化学反应。
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Likewise, the element that is a good electron acceptor in an electron transfer reaction is going to be the element that is going to hog the electrons in a covalent bond.
同样的，这个元素在一个电子转移反应中,是个很好的受赠者它将成为在共价电子,中吸引电子的元素。
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Well, if it is a good electron donor in an electron transfer reaction, if the same element finds itself in a covalent bond, it is going to be a good electron donor, although it is not full transfer.
如果它是一个在电子反应中,的好捐赠者，如果相同电子发现他在共价电子里，它将成为一个好的捐赠者，虽然没有完全转换。
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Just as I foreshadowed, if you look at the difference between the first and third quartile in the bond market -these are active returns over a ten-year period again ending June 30,2005 -and the fixed income market, the difference between first and third quartile is a half a percent per annum.
如我之前所示,如果观察,债券市场中的第一和第三个四分位数,四分位数即统计学中,把所有数值由小到大排列并分成四等份三个分割点位置分别就是三个四分位数 考虑十年期的主动型的收益,截止于2005年6月30日,在债券这个固定收益市场,第一和第三个四分位数,每年只差0.5%
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So even though we see a nodal plane down the center, I just want to really point out that it's only when we have a nodal plane in the internuclear or the bond axis that we're calling that a pi orbital.
虽然在中间有个节面，我想要指出的是,只有节面在核间轴,或者键轴上时,我们才叫它π轨道。
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A good example of that is CH4, because the CH bond is polar but symmetrically disposed in space.
甲烷就是一个很好的例子，因为极性键是,空间对称的。
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We can also think about the distance, the bond distance. So, which would you say is going to be shorter in this case?
我们还可以考虑一下距离，键的距离那么，大家认为其中哪一个键会更短一些？
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We're already using it up in this pi bond here, so that means we're limited to only two other spots on the molecule, so we have three.
我们已经把它用到这个π键里去了，所以这意味着,我们在分子里只剩下两个位置，所以一共是三个。
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Bond allocations had increased by more than could be explained by the increase in bond prices over the course of the year.
同时资产配置中的债券投资比重,以高于当年债券价格上涨的速度,有了显著增加
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The yield-to-maturity on an indexed bond is already in real terms because the coupons are indexed to inflation.
这种债券的到期收益率,就是实际收益率,因为票息已经被通胀指数化了
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As we see a little bit later, I could talk about the carbon-hydrogen bond in methane where there is a plurality of bonds. In this case, there is only the one bond but I just want to get the formulas.
因为我们后来看到一点点，我能讨论甲烷中的碳氢共价键,那有许多共价键，这种情况下，这只有一条共价键,但我想得到氟。
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The first one will be above and below the bond axis is where we'll see the electron density, and the second will be perpendicular to that, so it will be a density in front of and behind the bond axis.
第一个是在键轴之上和之下,我们可以看到电子密度，另外一个垂直于它，所以在键轴之前和之后有电子密度。
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If I short the one-period bond it cancels out, so I've made no net purchase in 1925.
卖空一单位一年期债券则刚好抵消,所以我在1925年的净买入为零
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/2 So this would mean the bond order is equal to 1/2, and in terms of valence electrons, how many bonding valence electrons do we have?
这意味着键序等于，对于价电子，有多少个成键价电子？
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So, in fact, yes, we did confirm that these covalent bond, at least in the case of hydrogen, we have confirmed by the numbers that we are at a lower energy state when we talk about the bonded atom versus the individual atom.
因此，事实上，是的，我们证实了共价键，至少在氢这种情况下，我们通过数据证实了,成键的原子处于能量更低的状态,当其与单个的原子相对比时。
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So, at any moment, you know in any bond which is the more electropositive.
在任何时候，你都能判断谁是正电性的。
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So, in talking about covalent bonds, we should be able to still apply a more general definition of a chemical bond, which should tell us that the h 2 molecule is going to be lower in energy than if we looked at 2 separate hydrogen atom molecules.
那么，既然提到了共价键，我们应该还可以,给化学键下一个更普遍的定义,那就是告诉我们氢分子能量应该更低,与两个分开的氢的单原子分子相比。
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In my final slide is a picture of the first indexed bond; this is issued by the State of Massachusetts I actually own this bond.
最后一张幻灯片是,第一支物价指数债券的照片,这是麻省州政府发行的,其实我收藏了这张债券
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Just so that we are clear, this is the bond in this compound.
所以我们明白，这是化合物中的共价键。
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