Atomic Theory Timeline

400

Democritus

Discovered and named the atom
400

The Greeks

played an important role in modern day science
Period: 400 to Oct 31, 1950

Atomic Theory
Oct 30, 1789

Antoine Laviosier

made a long list of discoveries including that the crystalline form of carbon was diamonds and that oxygen is present in acids
Oct 30, 1803

John Dalton

discovered Dalton's Atomic Theories
Oct 31, 1895

W.K. Roentgen

conducted an experiment on cathode rays and discovered x-rays
Oct 30, 1903

Marie Curie

discovered methods of separating radium from radioactive remains
Oct 30, 1903

Henri Becquerel

Discovered that rays that emitted uranium produced ionized gas
Oct 30, 1904

J.J. Thompson

created the Plum Pudding Model
Oct 30, 1909

Robert Milikan

performed the oil drop experiment
Oct 31, 1909

Ernest Rutherford

composed the gold foil experiment
Oct 31, 1918

Max Planck

created an equation describing the black body spectrum
Oct 30, 1922

Neils Bohr

Created the Bohr Planetary Model
Oct 30, 1925

Hans Geiger

invented the Geiger Counter
Oct 30, 1925

Werner Heisenberg

created the theory of quantum mechanics
Oct 30, 1926

Enrico Fermi

discovered the Fermi-Dirac statistics that add on to the Pauli Exclusion Principle
Oct 31, 1926

Erwin Schrodinger

created the quantum mechanical model
Oct 31, 1932

James Chadwick

Discovered the neutron

Democritus