一种元素一定数目的原子跟其他元素一定数目的原子化合的性质,叫做这种元素的化合价,是为了方便表示原子相互化合的数目而设置的。元素的“化合价”是元素的一种重要性质,它对化学式的书写、深入学习元素的性质起着重要作 The property of combining a certain number of atoms of an element with a certain number of atoms of other elements, called the valence of such an element, is set to facilitate the representation of the number of atoms intermingled. The “valence” of an element is an important element of the element. It plays an important role in the writing of chemical formulas and in the nature of the in-depth learning elements.