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440 BCE
Continuous theory of matter made by Aristotle and Plato, rejecting Democritus's theory and they believed that matter was infinite and divisible
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370 BCE
Democritus came up with the idea of atoms or "atomos", meaning indivisible particles, this was also the discontinuous model.
Democritus came up with the idea of atoms -
Dalton atomic theory, which was the first theory that described matter using atoms and their properties such as all atoms had the same mass.
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Thomson discovered the electrons in 1897, using the cathode ray experiment in which alpha particles bended towards a negative charge of electricity.
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JJ Thomson made plum pudding model of electrons scattered in the positively charged space.
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The nucleus of the atom was discovered by Rutherford and the nuclear atom model with neutrons and protons in nucleus were discovered in 1911
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Bohr Atomic model was with the electrons orbiting the nucleus was made in 1913
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Albert Einstein recognized photons, packets of electromagnetic radiation
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Erwin Schrödinger came up with the electron cloud model has dense nucleus with clouds of electrons that move like waves.
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Chadwick discovered the Neutron by using scattered data where he found the mass of the neutron in 1932
Chadwick discovered the Neutron -
Meitner discovered nuclear fission can produce massive amounts of energy. Nukes
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Goeppert-Mayer made the discovery of nuclear shell model for nucleus
Discovery of nuclear shell model for nucleus -
Quarks are the building blocks of positively or negatively charged atoms.