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Democritus
atomos, idea of the atom
Dalton
atoms are small, dense, and can’t be split; constant motion
JJ Thomson
cathode ray tube, electrons, plum pudding model
Rutherford
beam of alpha particles at gold foil, nucleus is small, dense, and positive
Bohr
energy levels of electrons, Bohr Model or Planetary Model
Chadwick
neutrons
Schrodinger
electrons in orbitals, Electron Cloud model
Hunds RUle
will add positive sign before negative sign
Pauli Exclusion Principle
No same spins exist in the same orbital
Aufbau Principle
electrons occupy orbitals with lowest energy level
Note 
Flashcard (41)