The Atom


The History

19th century- John Dalton describe atoms as solid spheres and different spheres make elements

1897- J J Thomson said atoms where not solid spheres but had a large positivly charged mass and smaller negitvaly charged electrons. This was known as the plum pudding model.

1909- Ernest Rutherford performed the gold foil experiment where they fired alpha particles at a hin sheet of gold foil due to the plum pudding modle they expected the alpha particle to pass straight through but they didn't some where deflected. So they came up with the idea that there was a…


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