Atom Structures By Zellare Aug 6, 1818 John Dalton Aug 6, 1903 Sir Joseph John Thomson Aug 6, 1911 Earnest Rutherford Aug 6, 1913 Niels Bohr Aug 6, 1920 Earnest Rutherford Aug 6, 1922 Niels Bohr Aug 6, 1932 James Chadwick