Atomic Structure
Atoms, elements and the particles inside them.
01Atoms and ElementsProtons, neutrons, electrons — and what makes an element.Read lesson →02Subatomic ParticlesMeet protons, neutrons and electrons and learn their charges and masses.Read lesson →03Atomic Number and Mass NumberUse proton and nucleon numbers to describe any atom.Read lesson →04Electron ShellsArrange electrons in shells and link the arrangement to the periodic table.Read lesson →