This vocabulary card sort allows students to practice matching vocabulary terms, diagrams, and their definition. This would be great for an engagement activity, for science stations, to check for student understanding, for review, re-teach, tutorials, or to be used as a spiraling activity. This card sort includes the following vocabulary terms: atom, nucleus, electron cloud, energy level, proton, neutron, electron, valence electron, atomic number, atomic mass, atomic mass, and atomic mass unit.