Matter is made of small indivisible particles. Democritus called these particles atoms.
Developed an atomic theory stating that spherical atoms had measurable properties of mass.
Discovers the electron and used cathode ray tubes to determine the charge to mass ratio. Found canal rays were associated with a proton
Discovers alpha and beta rays emitting from radium.
Publishes theory on special relativity and states that matter can be converted into energy.
Performed the gold foil experiment to determine that the nucleus is a small, dense, and positively charged part of the atom, based on the assumption that electrons are on the outside of the nucleus. Develops the plum pudding model of the atom.
Publishes paper regarding combining nuclear and quantum theories.
Electrons are similar to both particles and waves.
Developed quantum mechanics
Used the frequencies based on spectra lines to describe atoms.
Saw electrons as a continuous cloud and developed wave mechanics to be a mathematical model for the atom.
Discovered neutral atomic particle with similar mass to a proton, the neutron by using alpha particles.