Atomic Theory Timeline By KeiraQuigley 400 BCE Democritus 350 BCE Alchemists 270 BCE Cathode Ray Tube 1743 Joseph Louis Proust 1766 John Dalton 1770 Law of Definite Proportions 1778 Antoine Lavoisier 1789 Law of Conservation of Mass 1803 Dalton’s Atomic Theory 1869 Dmitri Mendeleev 1887 Henry Moseley 1897 J.J Thomson 1900 Plum Pudding Atomic Model 1901 Werner Heisenberg 1908 Gold Foil Experiment 1910 Oil Drop Experiment 1910 Robert Millikan 1911 Nuclear Model 1911 Ernest Rutherford 1913 Niels Bohr 1920 Planetary Model 1926 Erwin Schrodinger 1926 Quantum Mechanical Model 1932 James Chadwick
