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Well, if this bond has completely identically equal sharing of electrons, then this bond will be nonpolar.
如果一根键连的两个原子,对键上的电子吸引程度是完全等价的，那么这根键是非极性的。
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We can say that a nonpolar molecule you can have as a result of two different conditions.
所以你可以说非极性分子,有两种构成方式。
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The second way to have something that is net nonpolar is to have spatially symmetric disposition of polar bonds.
第二种构成,需要空间非极性,就是需要极性键的空间对称分布。
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Nonpolar molecules result from either, it's one or the other.
一个非极性分子，不是这一种就是那一种。
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Here is the question. Is methane a polar molecule or a nonpolar molecule? Let's look carefully.
问题是，甲烷是一个极性分子还是非极性分子,我们仔细看看。
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2 3 So, that means we've got one, two, three, four nonpolar bonds in here.
我们有，4个非极性的键。
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Symmetric disposition of polar bonds still results in a nonpolar molecule.
空间对称的极性键分布,还是会导致整个分子为非极性分子。
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If we can do that, we'll end up with a symmetric nonpolar molecule.
如果我们能这样做，我们就能得到那些对称非极性的分子。
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We somehow have to take hydrogen, attach it to carbon, and we have to make it symmetric, and we have to make it nonpolar.
我们需要把H接到C周围，而且我们需要让它是对称，且非极性的。
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And yet, the molecule is symmetric and nonpolar.
所以这个分子是对称非极性的。
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Whereas, H2 is nonpolar.
但是，氢气是非极性的。
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This is homonuclear and so these are nonpolar.
这是同核分子所以是非极性的。
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That is nonpolar. And likewise for fluorine, F2.
他就是非极性的，同样，氟气也是的。
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This bond will be nonpolar.
这个键是非极性的。
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And so, methane is nonpolar.
甲烷没有极性。
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All of these multiatomic moieties are nonpolar.
这些分子由多原子组成，但都是非极性的。
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What makes something polar versus nonpolar?
是什么让一个分子呈极性或者非极性？
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This bond is polar, but again, as I alluded to earlier, because the carbon is centered in the tetrahedron, because of the sp3 hybridization, the molecule itself is symmetric and nonpolar.
这个键是非极性的，但是，我们断言过早，因为C是中心原子，由于sp3杂化，这个分子本身是非极性的且对称的。
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