Describ the history of the atomic model.

1)19th century-John Dalton-solid spheres 2)1897-JJ Thomson-experiments of charge and mass showed they had electrons-plum pudding 3)1909-Ernest Rutherford-expering alpha scattering-alpha particles(+charge) at gold foil and went through (showed they had empty space), sometimes alpha particles were deflected (showed centre had a positive charge) and sometimes bounced straigh back (mass was concentrated in the centre), whith electrons around the edge 4)Niels Bohr-electrons contained in shells orbitting nucleus 5)Scientists discovered positive charge in nucleus is due to protons 6)James Chadwick discovered nucleus also had neutrons - neutral particles