This video helps the abstract concept of atoms become understandable. Many of the major scientific breakthroughs contributing to our understanding of atoms are highlighted. Colorful diagrams and animations describe the basic structure of atoms. Atomic number and atomic mass are also discussed. Other terminology includes: nucleus, neutron, proton, electron, energy level, electron cloud, atomic mass unit, and isotope.

Originally released by Visual Learning, 2005. Streaming video file encoded with permission for digital streaming by Infobase on April 18, 2015. Teacher's guide available under Additional info tag.

Small Particles (1:29); --Early Ideas about Atoms (1:23); -- Thomson's Model of Atoms (1:49); -- Rutherford's Model of the Atom (1:23); -- Bohr's Model of the Atom (0:48); -- Subatomic Particles (1:04); -- Nucleus (2:02); -- Isotopes (0:48); -- Atomic Mass (1:16); -- Electrons (1:36); -- Summing Up (1:42); -- Video Assessment (2:58); -- Credits: Atoms (0:44); -- Bohr (0:48); -- Neils Bohr (20:00); -- Ernest Rutherford Gold Foil Experiment- Discovering Nucleus (1:21); -- Mass (12:10); .