Atom Basics: http://www.chemtutor.com/struct.htm
Early Ideas about Atoms: http://galileo.phys.virginia.edu/classes/252/atoms.html
John Dalton's Atomic Theory: http://iun.edu/~cpanhd/C101webnotes/composition/dalton.html
JJ Thomson and the Electron: http://www.chemheritage.org/classroom/chemach/atomic/thomson.html
Rutherford and Bohr Break the "Plum Pudding" Model: http://www.pbs.org/wgbh/aso/databank/entries/dp13at.html
Chadwick (and Rutherford) and the Neutron: http://www.pbs.org/wgbh/aso/databank/entries/dp32ne.html
History of the Atom Timeline: http://timetoast.com/timelines/history-of-the-atomic-model--36
Early Ideas about Atoms: http://galileo.phys.virginia.edu/classes/252/atoms.html
John Dalton's Atomic Theory: http://iun.edu/~cpanhd/C101webnotes/composition/dalton.html
JJ Thomson and the Electron: http://www.chemheritage.org/classroom/chemach/atomic/thomson.html
Rutherford and Bohr Break the "Plum Pudding" Model: http://www.pbs.org/wgbh/aso/databank/entries/dp13at.html
Chadwick (and Rutherford) and the Neutron: http://www.pbs.org/wgbh/aso/databank/entries/dp32ne.html
History of the Atom Timeline: http://timetoast.com/timelines/history-of-the-atomic-model--36