高中化学选修3中介绍的价层电子对互斥理论,学生普遍感觉难以理解和记忆,为便于学生掌握这部分知识,笔者利用气球成功地使学生在轻松愉快中学好了VSEPR。VSEPR的理论要点是:①对于AB_m型共价分子,中心原子周围电子对排布的几何形状,主要取决于中心原子的价电子对数,而价电子对数等于成键电子对和未成 High School Chemistry Elective 3 introduces the valence level of electronic mutual exclusion theory, students generally feel difficult to understand and memory, in order to facilitate students to master this part of the knowledge, the author successfully using balloons to make students feel good relaxed VSEPR. The theoretical points of VSEPR are as follows: ① For the AB_m type covalent molecule, the geometry of the electron pairs around the central atom mainly depends on the valence electron logarithm of the central atom, which is equal to the bond electron pair and the unformed