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Democritus thought of the idea that everything in the universe was made up of invisible, indestructible atoms.
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Dalton's atomic theory consisted of three parts, all matter is made out of atoms, atoms are invisible and indestructible, and compounds are made of two or more atoms.
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Mendeleev was credited with creating the first periodic table in which he arranged the elements by their atomic mass.
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Goldstein was the first person to discover the proton by observing rays going from the from the cathode to electrons.
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Thomson discover the electron and developed the atomic theory.
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Planck is known as the creator of the quantum theory and contributed to the understanding of subatomic processes.
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Millikan determined the size of the charge in an electron through his famous oil drop experiment.
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Rutherford was the first to discover that atoms have a charged nucleus surrounded by empty space and circled by tiny electrons.
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Bohr found out that electrons travel in seperate orbits around the nucleus and that the amount of electrons determines the properties of the element.
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Schrodinger came up with the Electron Cloud Method which consisted of a nucleus surrounded by a cloud of electrons
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Chadwick discovered the neutron in the atom which is in the middle of the atom and doesn't have a positive or negative charge.
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Heisenberg is known for his theory of quantum mechanics.
