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Greek philosopher
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Hypothesized that the atom was a tiny
hard sphere, Believed that atoms of a given element
are identical, Created the atomic theory -
Discovered the electron, Used the cathode ray tube in his
discovery, Created the “plum pudding” model of
the atom. -
Did the gold foil experiment, Discovered that the proton had a
positive charge, Discovered that the atom is mostly
empty space, -
Created a model of the atom with
electrons moving around the nucleus in
fixed orbits , -
Uncertainty principle
A particle’s position, energy, and time
can never be precisely known, Worked with the Quantum Theory -
Deiscovered the neutron and founde the missing mass of the atom's nucleus.
