一、注意用比较的方式学习分子与原子原子分子概念化学变化中的最小粒子保持物质化学性质的最小粒子表示方法用元素符号表示,如H、He、Ne等用化学式表示,如H2、O2、CO2等相似性①都是构成物质的基本粒子.②都很小,都在不停地运动,都有一定的质量,都有间隔.③同种原子性质相同,? First, pay attention to the way to learn molecules and atoms in a comparative manner. The smallest particle in the chemical change of the concept of the smallest particles to maintain the chemical properties of the smallest particle representation using the element symbol, such as H, He, Ne and other chemical formula, such as H2, O2, CO2 and other similarities 1 are all basic particles that make up matter. 2 are very small, they all keep moving, they all have a certain quality, and they all have gaps. 3 are the same nature of atoms of the same species?