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alpha particles atom of hydrogen atomic object atomic phenomena atomic physics atomic weight basis become bodies Bohr's born Broglie century charge chemical classical colour complementarity complete concepts Crookes definite Democritus determine diffraction discovery Einstein elec electric electron elements emitted energy equal equation essence exactly exist experiments explain fact famous formula frequency gases grams Heisenberg hydrogen hypothesis idea J. J. Thomson knowledge laws light logical mathematics matrix matrix mechanics matter Max Born means measured Mendeleev method molecules momentum motion nature Niels Bohr nucleus observed obtain orbit oxygen pheno phenomenon photoelectric effect physicists picture Planck Planck's constant precisely predict principle probability properties quan quantum mechanics quantum number question radiation rays reason Schrodinger Schrodinger's scientific scientists sense simple sodium solar spectral lines spectrum string structure theory tion trajectory tron truth understand velocity vibration watermelon wave wavelength whole Wolfgang Pauli words wrote