atomic timeline By ameliabaker 1803 Billiard Ball Model John Dalton, 1803 1904 Plum Pudding Model JJ Thomson, 1904 1911 Nuclear Model Ernest Rutherford, 1911 1913 Niels Bohr Model 1932 Rutherford-Bohr atomic model James Chadwick, 1932 2000 Quantum mechanical model