ORGANIC CHEMISTRY Chapter l More than one equivalent lewis structure can be written for many molecules and ions. For example O :O: 0: O O 2 Resonance structures(共振结构式) Notice two important features of these structures 1. Each atom has the noble gas configuration 2. We can convert one structure into any other by changing only the positions of the electrons. we do not need to change the relative positions of the atomic nuclei Department of Chemistry, Xiamen UniversityORGANIC CHEMISTRY Department of Chemistry, Xiamen University Chapter 1 More than one equivalent Lewis structure can be written for many molecules and ions. For example: O C O O O C O O O C O O 1 2 3 Resonance structures（共振结构式） Notice two important features of these structures: 1. Each atom has the noble gas configuration. 2. We can convert one structure into any other by changing only the positions of the electrons. We do not need to change the relative positions of the atomic nuclei