Valence Number of bonds (see bonding) an atom can form.

元素的一个原子能够结合其它原子的数目。

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Determination of trace arsenic from water sample by hydride atom absorption, and effect of valence number of arsenic and varied coexisting ions on the determination were discussed.

采用氢化物原子吸收法测定样品中痕量砷，对于样品的前处理及采用氢化物法测定砷含量时，砷的不同价态及共存离子的影响，分别进行了探讨。

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For our step two, what we need is number of valence electrons.

我们的第二步，需要知道价电子的个数。

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So in terms of nitrogen that starts off with a valence number of 5, again we have 2 lone pair electrons in the nitrogen, and again, we have 6 electrons that are shared.

对于氮来说,我们应该从五个价电子开始，同样，氮也有两个孤对电子，共用电子的个数也一样，是六个。

麻省理工公开课 - 化学原理课程节选

And if we talk about chlorine, and both of the chlorines are the same in this case, we start with a valence number of 7 for chlorine, and then we subtract 6, because it had 6 lone pair electrons around each of the chlorine atoms.

而如果我们讨论氯的话，在这个例子中两个氯的情况都是一样的，从七个价电子开始，然后减去六，因为每个氯原子周围,都有六个孤对电子。

麻省理工公开课 - 化学原理课程节选

So then in order to figure out the complete number of valence electrons in our molecule, we just add 5 plus 4 plus 1.

那么接下来为了得到,这个分子中价电子的总个数，我们只需要将五加上四，再加上一。

麻省理工公开课 - 化学原理课程节选