Abstract The application of the valence shell electron pair repulsion(VSEPR)theory allows for a straightforward prediction of the spatial configuration of ABn type molecules or ions.The VSEPR theory links the electron distribution of ground state atoms and the hybrid orbital theory.It is also the foundation for studying intermolecular forces and coordination compounds.Proficiency in VSEPR theory enhances the logic of learning structural chemistry and improves the affinity for learning abstract content.This article employs the NO2 molecule,which does not fully conform to the VSEPR prediction,to design and implement a series of progressive discussions around its valence bond structure and bond angles.It concludes with an exploration of“resonance theory”and“three-electron bond”to extend learning,consolidating the teaching content while igniting the enthusiasm for seeking the truth.This approach guides students to understand the VSEPR theory objectively and comprehensively,cultivates a dialectical thinking habit of approaching scientific principles with an evolutionary perspective,and improves ideological and political literacy.
LI Chun-Xia, NIU Yin-Yao, HE Wei-Na, YAN Zhong-Hong. Progressive Discussion-Based Teaching Design and Practice:Learning Valence Shell Electron Pair Repulsion(VSEPR)Theory[J]. Chinese Journal of Chemical Education, 2025, 46(6): 75-82.
