学习了分子、原子、离子、元素及化学式的知识之后,有些学生对于物质构成的说法经常出现知识性错误.笔者从常见题型中总结特点,帮助学生把握中考动向,走出误区.一、物质构成的特点1.由原子构成的物质:金属、稀有气体、固态非金属单质. After learning the knowledge of molecules, atoms, ions, elements and chemical formulas, some students often make knowledgeable mistakes about the formation of substances.The author summarizes the features from common questions to help students grasp the entrance exams and get rid of the errors. Features 1. By the composition of atoms: metals, rare gases, solid non-metallic single.