Democritus  (400BC) - gave us the word "atomos, John Dalton  (1808) - Ideas known as Postulates/ elements have identical atoms/ sphere model, JJ. Thomson(1904) - plum pudding model/ atom is neutral due to positive and negatives, Schrodinger (1926 to present) - Quantum model/ electrons in energy clouds and can move between them, Bohr  (1913) - planetary model/electrons orbit, Rutherford(1911) - nuclear model/ gold foil experiment to find nucleus/mass in center of atom, Broglie (1924) - electrons are waves, Chadwick  1932 - discovered the neutron and the fact its mass equals close to proton, Mendeleev (1869) - constructed first periodic table,

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