化合价是对给定元素的原子间的化学结合构成的数量的度量.
以上是我自己的理解翻译,下面是大学对化合价的定义：（靠谱）
化合价是表示一种元素的一个原子能和其他原子相结合的数目.
Valency is a measure of the number of chemical bonds formed
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