Hydrogen, helium and lithium | Johnstone’s triangle | 11–14 years

Develop learners’ thinking about the arrangement of atoms in elements at three different conceptual levels: macroscopic, sub-microscopic and symbolic. This resource is made up of a Johnstone’s triangle worksheet, which helps learners connect their understanding of the macroscopic properties of hydrogen, helium and lithium with symbolic representations and sub-microscopic thinking about atoms and molecules.