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This is pure covalency. This is polar covalency.
这是平均共价，它是极性共价。
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This is the homonuclear bond energy for hydrogen in pure hydrogen. There we have perfect covalency.
这是氢的同原子的共价能,在纯氢中，我们有完美的共价键。
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Because this is a dipole, he chose the pole part of dipole to give us polar covalency.
这就是偶极，鲍林选择了偶极中“极“这一部分来,组成极性共价这个词向我们诠释。
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So you can see that polar covalency is a tendency towards ionic bonding.
所以你看得出极性共价就是,趋向离子键的。
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And he coined the term "polar covalency."
他创造出还提出了一个属于有极性共价键“
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And why did he call it polar covalency?
为什么要称它为极性共价呢？
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Just to give you a sense of what that means, if the 264 figure is pure covalency and the 344 is partial ionic character, what fraction of the 608 is 344? 344, which is partial ionic character, 57% divided by 608 times 100 is 57%.
它只是给你一个这样的概念，264千焦每摩是完全共价成分的键能,而344是离子成分的，344除以608是多少，344，是不完全的离子特性，除以608乘以100得到。
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