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Democritus stated that everything are made up of very small things which he called " Atomos " which meant indivisible
John Dalton created his atomic theory that sates atoms are the smallest unit of matter
J.J Thomson with the help of his invention the Cathode Ray Tube, discovered the electron and the proton which was sub atomic, thus disproving John Dalton's atomic theory
Ernest Rutherford's model describes the atom as a dense, positively charged core called a nucleus surrounded by negative charges which were electrons
Niels Bohr discovered the energy levels where electrons can be found
James Chadwick discovered the neutron
The modern atomic model describes the atom as a particle with a dense center with a cloud surrounding it. The cloud is where the electrons can be found
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