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Democritus proposed that all things are composed of the atomos or thev fundamental, indivisible particles, atoms; atoms cannot be destroyed; atoms are separated by the void or empty space, atoms are in constant motion, and undergo constant change through the void.

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Aristotle did not believe that matter was made of atoms, but rather of four elements - earth, fire, water, and air He believed all substances were made of varying amounts of these elements

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He believed all matter was comprised of indivisible and indestructible atoms with distinct masses and properties

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sorta like Dalton he thought alike all atoms contain tiny negatively charged subatomic particles or electrons

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He postulated the nuclear structure of the atom, discovered alpha and beta rays and proposed the laws of radioactive decay

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The Bohr model postulates that electrons orbit the nucleus at fixed energy levels.

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the probabilistic nature of the electron and applying it to the model of the atom.

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James Chadwick's contribution to the atomic model was his discovery of the neutron.