This detailed atomic structure poster features a Bohr model diagram and a comparison table of all three subatomic particles (proton, neutron, electron) with their charge, mass in amu, and location. Students learn the definitions of atomic number and mass number, with a worked example using Carbon-12 (6 protons, 6 neutrons, 6 electrons; atomic number 6; mass number 12). Perfect for: • Middle school and high school chemistry units on atomic structure • Periodic table and element instruction • Cl