History of the Atom Project By hartungb25 400 BCE Democritus Proposes the Idea of the Atom 1808 John Dalton Creates Atomic Theory 1897 J.J. Thomson Discovers the Electron 1898 Marie Curie Discovers Radioactive Elements Radium and Polonium 1907 Ernest Rutherford discovers Radioactive Half-Life 1913 Niels Bohr Creates the Bohr Atomic Model 1926 Erwin Schrödinger Makes Wave Equation 1932 James Chadwick Discovers Neutrons in Atoms
