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元素及其化合物知识多而杂，它们在性质方面既存共性又有特性。因此，在复习这类化学知识时，要善于把零碎的、杂乱的知识同基本概念等联系起来，使之条理化、系统化、规律化。复习时要“六抓”。一、抓关键复习元素与化合物知识时，头脑中要有一条线。这条线是结构一性质一存
The knowledge of elements and their compounds are numerous and complex. They share both commonalities and characteristics in nature. Therefore, in reviewing this type of chemical knowledge, we must be good at linking piecemeal and disorganized knowledge with basic concepts, so as to make it systematic, systematic, and regular. When reviewing, it is necessary to “scratch.” First, grasp the key to review elements and compound knowledge, the mind must have a line. This line is the structure of a property