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Events

Democritus proposes that matter could be broken down into particles that were small, hard, and indivisible. At the time, his ideas were not widely believed because he had no concrete evidence.Antoine Lavoisier proposes the Law of Conservation of Mass. He theorized this using his favorite experiment, the breaking down of HgO into Hg and O.John Dalton proposed the modern Atomic Theory. John Dalton used previous laws, including Lavoisier's Law of Conservation of Mass.JJ Thomson discovered the electron. His findings came from cathode ray experiments.Ernest Rutherford discovers the nucleus of the atom. He theorized this using the Gold Foil experiment.Robert Millikan discovered the magnitude of the charge of the electron. He used his well-known Oil Drop experiment.Marie Curie discovers radium and polonium. She used her examination of many substances and proof of radium's radioactivity to prove the existence of radium.James Chadwick discovers the neutron. To do this, he drew from an experiment in which beryllium was bombarded with alpha particles.Max Planck explain hot glowing matter using quanta. He solved the necessary equation using then-known scientific laws.Albert Einstein publishes the equation E = mc^2. Einstein utilized thought experiments and further developed previous equations.Einstein formulates the Special Theory of Relativity. Einstein utilized thought experiments and further developed previous equations.Niels Bohr proposes a planetary model of hydrogen using the quantum theory. He used the emission spectra of hydrogen.Louis de Broglie theorizes electron waves. His experiment involved the reflection of electrons against crystals and their spread through thin foil.Erwin Schrödinger develops the quantum mechanical model of the atom. He derived this model with the help of other mathematical models and equations.Werner Heisenburg publishes the uncertainty principle and the theory of quantum mechanics. Theoretical experiments done with Bohr led to his findings.