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初中化学里有许多内容都跟“三”有关,为方便同学们记忆化学知识,现总结归纳如下: 1.构成物质的微粒有三种:分子、原子、离子。2.构成原子的微粒也有三种:质子、中子、电子。3.地壳里含量居前三位的元素:O、Si、Al。4.元素根据性质可分为三类:金属元素、非金属元素、稀有气体元素。5.工业生产中的三废:废渣、废水、废气。
There are many contents of junior high school chemistry related to the “three”. To facilitate the students to memorize the chemical knowledge, they are summed up as follows: 1. There are three kinds of particles that make up the substance: molecules, atoms, and ions. 2. There are also three types of particles that make up an atom: protons, neutrons, and electrons. 3. The top three elements in the earth’s crust: O, Si, Al. 4. Elements can be divided into three categories according to the nature: metal elements, non-metallic elements, and rare gas elements. 5. Three wastes in industrial production: waste residue, waste water, and waste gas.