JJ Thompson - Discovered negatively charged electrons, Leucipitus & Democritus - Proposed that matter is formed by miniscule particles called atoms. , John Dalton - Proposed that molecules are small, hard spheres, Aristotle & Empedocles - Said that matter is made up of four elements: Earth, water, air and fire, Werner Heisenberg - Said that electrons orbit in a cloud around the nucleus; they have no exact position, Ernest Rutherford - Discovered the nucleus, a small hard center of positive charge, containing protons and neutrons, Neils Bohr - Proposed that electrons are located in energy levels,

Sci 9 - Ch.1 - The Scientists behind the Atom

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