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Now, remember, the formation of the ionic bonds was from group one and group two, and over here with group six and seven.
现在请记住，离子键的形成,从第一族和第二族元素，与六七主族的元素相互构成的。
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It allows for plurality of bonds from any ion.
对于任何离子，能形成很多键。
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And then we end up having 6 shared electrons, 2 from each of the bonds, so we end up with a formal charge on sulfur of plus 1.
然后我们有六个共用电子，每个键两个，因此最终硫的形式电荷量为正一。
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The costs were huge -not just the immediate costs in terms of the move from stocks to bonds.
代价是巨大的,不仅仅是卖掉股票,和买进债券的直接交易成本
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BH3 All of our electrons are in our bonds, we want to got them a 120 degrees away from each other, that's as far away as we can get them.
比如说，它是这样的，所有的电子都在键中。
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So, using our simple valence bond theory, what we would expect is that we want to pair up any unpaired electrons in methane with unpaired electrons from hydrogen and form bonds.
利用简单的价电子成键理论，我们预计,要把所有甲烷中没有配对的电子,和氢原子中没有配对的电子配对来形成键。
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Now, the problem is that if you invest in bonds from some state or local government, they might not pay you back; they can just go bankrupt.
现在的问题是如果你投资了,州或者地方政府发行的债券,他们可能无法支付,他们可能会破产
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They also have government-issued notes and that's from one to ten years and bonds this is just jargon- these are ten or more, well actually more than ten.
中期债券期限通常是,一年至十年,这些都是行话,长期债券期限,在十年以上
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Plurality of bonds can form from any ion.
大量的键通过任意离子形成。
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Essentially what you have is bonds resulting from the pairing of unpaired electrons.
本质上就是由于,未配对电子配对导致的成键。
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But, when you move from lending money to the government -either short-term with bills or longer term with bonds -to investing in the equity market, there's a stunning difference in terms of the returns.
当你转变投资方式,从借钱给政府,即通过短期债券或长期债券的形式,变成投资于股票市场,回报率的差别会大到让你吃惊
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I bought a number of two-period bonds such that the value of my purchase exactly equals the proceeds that I get from shorting the one period bond, so I've made a zero wealth transaction.
我买入了一定数量的两年期债券,其成本刚好等于我卖空,一单位一年期债券获得的资金,我做的是零成本交易
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I computed the returns on the stocks, bonds, and oil for every year from 1983 and I computed the average returns, which I take as the expected returns, I took the standard deviations, and I took the covariance.
我计算了从1983年以来每年的股票,债券和石油的收益，从而得出平均收益率，这些平均收益率作为预期收益率，然后算得标准差及协方差。
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So we end up with 3 s p 2 hybrid orbitals, so we can think about what would happen here in terms of bonding, and if we think about how to get our bonds as far away as possible from each other, what we're going to have is the trigonal planer situation.
因为现在sp2轨道有1/3的s特征，2/3的p特征，而不是3/4。,我们最后得到3个sp2杂化轨道，我们可以想象,成键时会发生什么，如果我们考虑。
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