An introduction to the noble gases and chemical bonding via Lewis theory and the octet rule are common inclusions in secondary school curricula. However, the usual approach may lead to misconceptions and difficulties when valence bond (VB) theory and valence shell electron pair repulsion (VSEPR) theory are taught at a later pre-university stage.…

This paper is a case study that reports on findings from a design-based research with the purpose of helping secondary school chemistry students in an all-girls school develop the ability to construct scientific explanations--an important literacy skill in learning science. A series of lessons on the topic of chemical bonding was designed to…