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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