Abstract In order to conduct an in-depth study of the valence shell electron pair repulsion model, this paper divides the common molecules into several categories according to the similarities and differences of the molecules: ABn(B is a non-hydrogen atom), HxA(simple hydride), HxABn(complex covalent molecules). When calculating the number of electron pairs in the valence shell of common molecules, firstly calculate the total number of valence shell electrons V, and then use the “quotient-remainder” method: V8=n…m, n as the number of octet atoms, m2 as the lone electron pair of the central atom A, x as the number of coordinating hydrogen atoms. Then according to VP=BP+LP=x+n+m2, calculate the number of valence layer electron pairs. From the calculation of the number of valence shell electron pairs of three different types of molecules, this paper concludes the thinking model of calculating the number of valence shell electron pairs of the common molecules by the “quotient remainder” method, which helps promote the construction and development of students' cognitive models.
DONG Yong-Jun. Calculating the Number of Valence Shell Electron Pairs of Common Molecules by “Quotient-Remainder” Method[J]. Chinese Journal of Chemical Education, 2023, 44(7): 113-118.