近年来,求化学式的题目在各地中考化学试卷中频频出现。现以一些典型试题为例,帮助同学们分析一下这类题目的解法。一、根据原子结构求解由元素原子最外层的电子数目可推知元素的化合价,再根据元素的化合价便可写出物质的化学式。例1X元素的原子最外电子层上有1个电子,在由X、Y In recent years, the topic of seeking chemical formulas has frequently appeared in chemical test papers in local examinations. Now take some typical questions as an example to help students analyze the solution to this type of problem. First, the valence of an element can be deduced from the number of electrons in the outermost layer of an element atom based on the atomic structure, and then the chemical formula of the substance can be written based on the valence of the element. The electrons in the outermost electron layer of the atom of the example 1X element have 1 electron, in X and Y