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printf That's not actually where someone implemented print F and related functions, rather, in dot H files, by convention, are prototypes.
那实际不是有某人在哪里执行,相关函数，而是在，h文件中，按照惯例，它们是函数原型。
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And so this is the H-F bond in HF.
所以这是氟化氢中的氢氟共价键。
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All right, so the type of bond energies that we can go and look up in tables are individual atom bonds, H-H, F-F, and the like.
好的，键能的类型,我们能够在表中查到,都是独立的原子键，H-H，F-F以及类似的。
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And then this second term, if we go to the Periodic Table, 2 we will find that the value here for hydrogen is 2.2 98 and the value for fluorine is 3.98.
再算上第二个条件，翻看元素周期表，我们查处H，F电负性分别为2,2。2，3。
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And, that gives you a number for the fluorine, minus 0.29. Now, if you do the same for the hydrogen, you'll come up with the same number.
然后给出F的数字，负的0。29，如果同样的用H来计算，你会得到一样的答案。
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Let's go through this calculation for HF.
我们把H，F数据代入检验这个公式。
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