C, O and Co | Johnstone’s triangle | 11–14 years

Develop learners’ thinking about symbols and formulas at three different conceptual levels: macroscopic, sub-microscopic and symbolic. This resource is made up of a single-page Johnstone’s triangle worksheet, which helps learners connect their understanding of the difference between symbolic representations of carbon dioxide and cobalt with sub-microcopic and macroscopic thinking. The teacher guidance includes model answers.