Abstract

LAMOUREUX, G.  and  OGILVIE, J. F.. Obsolete Models in Introductory and Organic Chemistry. Educ. quím [online]. 2022, vol.33, n.2, pp.235-247.  Epub Nov 28, 2022. ISSN 0187-893X.  https://doi.org/10.22201/fq.18708404e.2022.2.80758.

In this analysis, we discuss two models in chemistry that we consider obsolete: hybrid atomic orbitals (HAO) and valence-shell electron-pair repulsion (VSEPR). We present a thorough discussion, with examples in hypervalent and main-group molecules, of problems when and where HAO are used. Common misconceptions in the use of HAO are highlighted, particularly in relation to purported lone pairs. VSEPR is then shown to be problematic; the links among HAO, VSEPR and resonance structures present further anomalies.

Keywords : hybrid atomic orbitals; valence-shell electron-pair repulsion; teaching introductory chemistry.

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