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James Chadwick was the first person to discover the neutron. Chadwick stated that there was a particle with no charge existed in an atom that had around the same mass as a proton. This was later proven to be a neutron.  Notes Picture

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He performed what was called a "oil-drip' experiment to determine the charge of one electron and by using the mass- charge ratio, he was able to find that one electron has a mass of 9.11x10^-28g. Facts. Picture.

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Formulated a atomic theory of matter with 4 postulates: elements are composed of atoms, all atoms of a given element are identical, atoms are neither created nor destroyed in a chemical reaction and compounds always contain the same proportion of elements. Facts. Picture.

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 1925                       Wave Model of the atom

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 1925                       Wave Model of the atom

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Electrons are in a specific location but do not move around on an atom in a definite path. (Notes)
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1913                      Bohr's theory of the atom

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1913                      Bohr's theory of the atom

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Bohr came up with the theory that energy is transferred only in certain well defined quantities. He also thought the electrons moved around the nucleus but only in prescribed orbits. Facts. Picture.

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1911           Rutherford’s theory of the atom after the famous gold foil experiment

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1911           Rutherford’s theory of the atom after the famous gold foil experiment

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Rutherford shot alpha particles at a sheet of gold foil and some on the "bullets" bounced off proving that atoms have a dense, positively charged center. (Notes)

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1897                             JJ Thompson plum pudding theory of an atom 

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1897                             JJ Thompson plum pudding theory of an atom 

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He said that atoms are made up of even smaller particles. He also studied the passage of electrical current through a gas. He found out that a atom is divisible. (Notes) Picture

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1801                       Dalton's theory of the Atom

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1801                       Dalton's theory of the Atom

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Dalton's theory stated that everything is made of atoms. Atoms are indestructible and cannot be divided. (Notes)
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332 BCE                         Aristotle

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332 BCE                         Aristotle

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He was a philosopher that had the theory that everything was made up of earth, fire, air and water. (Notes) Picture

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Very first person to have the idea the atom. Believed that everything in the universe was made of atoms. He said that atoms were small, hard particles that were different shapes and sizes. (Notes)

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