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400
Democritus
Matter consists of separate, partless, solid, eternal, immutable, invisible and intangible unit-particles which are physically and theoretically indivisible atoms (the ‘uncuttable’);
Atoms differ in shape (A from B), position (Z from N) and order (AN from NA) but not in quality;
Empty space or void is necessary for their movement;
Perceptible change and plurality are the result of the transfer of momentum by the moving atoms and such transfer occur by contact -
Dalton
Daltons Theroy
disproved because Dalton included an additional postulate that prevented his theory from being accepted -
Thomson
In 1897 the British physicist Joseph John (J. J.) Thomson (1856–1940) discovered the electron in a series of experiments designed to study the nature of electric discharge in a high-vacuum cathode-ray tube, an area being investigated by numerous scientists at the time. disproved because Dalton's atomic theory states that atoms are indivisible (meaning atoms cannot be broken any further into smaller particles) -
Bhor
The Rutherford–Bohr model of the hydrogen atom (Z = 1) or a hydrogen-like ion (Z > 1), where the negatively charged electron confined to an atomic shell encircles a small,neucleus -
Rutherford
Rutherfords Gold Foil Experiment Although everything about Thomson’s experiments suggested the plum pudding model was correct. According to the scientific method, any new theory or model should be tested by further experimentation and observation. model incorrect. -
Schodinger
it simply says that a quantum system's makeup and working is in some sense "constant" when the system is sundered from the rest of the World.
