Abstract:

The valence shell electron pair repulsion (VSEPR) theory, an important part of the modern valence bond theory, can be used for qualitatively determining the spatial configuration of simple molecules (or ions) and the hybridization mode of central atoms. There are some blind spots in teaching the VSEPR theory, such as the unclear nature of the electron pair repulsion, the difficulty in understanding of the hypothesis that oxygen atoms do not provide valence electrons as coordination atoms, and the unclear difference between VSEPR theory and hybrid orbital theory. In the light of this, this paper shows some teaching optimization methods that improve students' understanding of the nature of VSEPR theory and the ability to accurately judge molecular spatial configurations by clarifying the regulatory nature of valence electrons provided by coordination (terminal) atoms, the impact of oxygen atom positions and bonding types on the molecular (or ion) structures, and the effect of multiple bonds on the molecular (or ion) spatial configurations, as well as by teaching the VSEPR theory prior to the hybrid orbital theory.

Key words: Valance shell electron pair repulsion theory, Valance shell electron pair, Molecular spatial configuration, Inorganic chemistry, Teaching optimization