The Events of History of Atomic Theory By EmilyPsTeehee 460 Democritus Democritus Discovered and named the atom Feb 4, 1766 John Dalton Dalton Theories based on experiments Feb 4, 1856 J.J. Thomson Thomson Discovered the positive and negative portion of atoms Feb 4, 1858 Max Planck Planck Discovered Energy Quanta Feb 4, 1871 Ernest Rutherford Rutherford Discovered the nucleus of the atom and the planetary model Feb 4, 1877 Francis Aston Aston The Whole Number Rule Feb 4, 1885 Niels Bohr Bohr Electrons with low energy would orbit closer to the nucleus while electrons with high energy orbit further from the nucleus Feb 4, 1887 Erwin Schrodinger Schrodinger Discovered new productive forms of the atomic theory Feb 4, 1891 James Chadwick Chadwick Discovered the neutron Feb 4, 1892 Louis de Brogile Brogile Discovered the wave nature of electrons Feb 4, 1901 Werner Heisenberg Heisenberg Created Quantum Mechanics Feb 4, 1902 Paul Dirac Dirac Even newer and more productive form of the atomic theory
