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根据已知条件,确定物质的化学式是初中化学的一个难点,我通过十多年的教学实践,总结出了确定物质化学式的几种解法,归纳如下:一、根据原子结构特征确定化学式例X原子最外层有3个电子,Y原子最外层有7个电子,则X与Y原子构成的化合物的化学式为()。解析:因为X原子与Y原子化合要形
According to known conditions, determining the chemical formula of a substance is a difficult point for junior high school chemistry. Through more than ten years of teaching practice, I have summarized several methods for determining the chemical formula of a substance, which can be summarized as follows: 1. Determine the X atom of the chemical formula according to the characteristics of the atomic structure. The outermost layer has three electrons, and the outermost Y atom has seven electrons. The chemical formula of the compound composed of X and Y atoms is (). Analysis: Because the X atom and the Y atom combine to form