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一、案例背景《原子核的组成》是新版苏教版教材内容。如何在学习完《院子结构模型的演变》和《原子核外电子排布》两节内容后带领学生走进更抽象的原子核的组成微观领域,如何提起学习抽象知识的兴趣,直观展现微观世界成了难题。我在设计导入时做了很多尝试。好的引课不但有引出新课的功能而且还应该贯穿整堂课的始终。“四数”关系是本课的重点又是本课的难点,以往的突破方法是利用数据计算出原子相对质量,凸显的是推理分析及数据处理的能力。
First, the case background “The composition of the nucleus” is a new version of the Sujiao version of teaching materials. How to bring students into the abstract micro-sphere of atomic nucleus after learning the contents of “evolution of the yard structure model” and “outer electron arrangement of the nucleus”, and how to lift interest in learning abstract knowledge and visualize the micro-world becomes a problem . I did a lot of design when I imported it. A good lesson not only leads to the function of a new lesson but also should run through the entire lesson. “Four numbers ” relationship is the focus of this lesson is the difficulty of this lesson, the previous breakthrough is to use the data to calculate the relative mass of the atom, highlighting the ability of reasoning analysis and data processing.