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The Atomic Theory is the theory that all matter is made up of tiny indivisible particles  known as atoms.

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The Atomic Theory is the theory that all matter is made up of tiny indivisible particles  known as atoms.

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Democritus lived in Greece and he helped contribute his ideas to the Atomic Theory. He states that "everything is composed  of atoms."

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John Dalton lived in Manchester when he contributed to his ideas on the Atomic Theory. He proposed all matter was composed of atoms and he introduced this to chemistry.

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Dimitri Mendeleev lived in Russia when he created his idea of the "Periodic Law". This law was his formulation of the periodic table of elements.

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JJ Thompson lived in England and discovered the electron and proved his findings by demonstrating that cathode rays were negatively charged.

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Ernest Rutherford lived in England as well when he proposed his "Rutherford Model". His planetary model consists on his ideas that atoms have a small charged nucleus surrounded by space, then are circles with electrons. (Also can be known as finding the structure of an atom).

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Niels Bohr lived in Denmark when he created his "Bohr Model". He discovered that energy is transferred only in certain well defined quantities. (hydrogen atom)

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Erwin Schrodinger lived in Austria when he made his discovery. Schrodinger took the "Bohr Model" one step further and named his model the "Quantum Mechanical Model." He found the likelihood of an electron in a certain position using mathematical equations.