Democritus, Proposed idea of atoms in 4th Century B.C., Dalton, Atomic theory, Mendeleev, First periodic table—arranged by mass, Einstein, Light can behave as a particle (photon), JJ Thomson, Discovered electron (plum pudding model), Planck, Quantum nature of energy, Millikan, Exact charge of an electron, Rutherford, Discovered nucleus (gold foil experiment), Moseley, Modern periodic table—arranged by atomic number, Bohr, Planetary model of atom, de Broglie, Particle and wave duality, Heisenberg, Uncertainty principle, Schrodinger, Modern mathematical model (electrons in clouds)—Quantum Mechanical Model, Chadwick, Discovered neutron

Atomic Theory Scientists

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