The History of the atom

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Theory of atomic structure has changed over time. 

19th century- John Dalton described atoms as solid spheres and said that different spheres made up different elements. 

1897- JJ Thomson concluded that they weren't solid spheres. Measurements showe that an atom must contain even smaller particles (eg. electrons) - changed to plum pudding model. 

Plum Pudding model= ball of postive charge with electrons stuck in it.

1909- Rutherford proved plum pudding was wrong.

Alpha particle scattering experiments. Fired positively chaarged alpha particles at…


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