Development of Quantum Mechanics

1895 Roentgen x-rays
1897 Thomson discovery of electron
1898 Mme. Curie radioactive polonium and radium
1901 Planck blackbody radiation
1905 Einstein photoelectric effect
1911 Rutherford model of atom
1913 Bohr quantum theory of spectra
1922 Compton scattering of photons off electrons
1924 Pauli exclusion principle
1925 deBroglie matter waves
1926 Schroedinger wave equation
1927 Heisenberg uncertainty principle
1927 Davisson and Germer wave properties of electrons
1927 Born interpretation of wave function
1928 Dirac relativistic wave equation, positron