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Atomic Physics: Task 1 1.2 Explain the evidence for the existence and structure of atoms. Use the resources provided (Colson, Rob, Hallinan, Camilla and John, David (eds) (2014) The Science Book London: Dorling Kindersley) and other sources to investigate the experimental evidence for the existence and structure of atoms. • Complete the table to explain the conclusions that can be drawn from the experimental observations and theories. You should refer to the work of the scientists listed. Expand the boxes as required. You are encouraged to include diagrams in your explanations. Aspect of the Experimental Explanation of how the observations and the interpretation of atom Evidence these experiments have provided evidence about each aspect of the atom. Existence and Brownian Motion size of the atom. Robert Brown • Albert Einstein Existence and properties of electrons Cathode Rays • JJ Thomson • Robert Milikan Distribution of positive charges within the atom Alpha particle scattering • Emest Rutherford & Ernest Marsden Location of negative charges within the atom Atomic Spectra Gustav Kirchhoff and Robert Bunsen Niels Bohr