This learning resource focuses on the topic of atomic structure and the historical development of atomic models. Students will explore the size of an atom, the composition including protons, neutrons, and electrons, and how scientific understanding has evolved over time. Activities include examining a microscopic image to understand the scale of atoms, creating initial atomic models, and reflecting on the history of atomic theory through a timeline. The resource encourages students to engage with the material actively by sketching, labeling, and participating in reflective questions about the nature of scientific change.