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1926, Austria. Took "Bohr Model" further, discovered the Quantum Mechanical Model of an atom by using mathematical equations to find the likelihood of an electron in a certain position.

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1913 Denmark. "Bohr Model"- discovered that energy is only transferred only in certain, well defined quantities.

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1911, England. "Rutherford Model"- Also known as Planetary Model. Discovery that atoms have a small charged charged nucleus, surrounded by space, then circled with electrons.

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His theory was discovered in the 5th century B.C. in Greece. The atomic theory stated that everything is composed of atoms.

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A continuation of the atomic theory, stated in 1803 in manchester, that all matter was composed of atoms, and introducing his ideas into Chemistry.

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In 1869 in Russia Mendeleev formulated the periodic table of elements, and properties of the elements.

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1897, England. "Atomic Theory" - discovered the electron, and demonstrated that rays were negatively charged.