The Basic Structure of the Atom | Chemistry and Our Universe: How it All Works

Introduction to Atoms and Subatomic Particles00:00:22

Introduction to the modular nature of the universe. The atom is defined not as an indivisible unit, but as a system composed of protons, neutrons, and electrons.

Historical Development of Atomic Theory00:03:35

A look at the contributions of ancient Greek philosophers and John Dalton, whose laws of conservation of mass and multiple proportions provided the first scientific evidence for atoms.

Discovery of Electrons and the Nucleus00:08:48

J.J. Thompson’s discovery of the electron using cathode ray tubes and the subsequent 'plum pudding' model, which was later corrected by Ernest Rutherford’s gold foil experiment, identifying the dense nucleus.

Completion of the Atomic Inventory00:17:36

James Chadwick’s discovery of the neutron, explaining the mass and stability of the nucleus, completing the understanding of the three primary subatomic particles.

Isotopes and Ionization00:21:08

An explanation of how varying neutron counts result in isotopes and how imbalances between protons and electrons create charged ions (anions and cations).

Conclusion and Preview00:27:21

Review of the atomic structure and the role of protons in defining elements. The lecture concludes by setting the stage for future discussions on complex electron orbital structures.