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Niels Bohr
Developed the Bohr model, he proposed that energy levels of electrons are discrete and that electrons revolve in stable orbits

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John Dalton
Created the first chart of atomic weights
He discovered this theory while experimenting with gases

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Erwin Shrodinger
Made an atomic model called the Quantum Mechanical model of an atom
It came as a result of his dissatisfaction with the quantum condition in Bohr's orbit theory and his belief that atomic spectra should really be determined by some kind of eigenvalue problem.

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Ernest Rutherford
First one to split atom, demonstrated that a atom has a tiny, heavy nucleus
Ernest and his team of scientists shot alpha particles at aluminum foil and found the nucleus

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Dimitri Mendeleev
Listed elements in atomic weight and put them into columns
He arranged the elements known at the time in order of relative atomic mass

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JJ Thompson
Discovers electrons by experimenting with a Crookes, or cathode ray, tube. He demonstrated that cathode rays were negatively charged.

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Democritus
Discovers everything is composed of atoms
He contributed to the theory of atomism, propounded by his teacher Leucippus, by suggesting that all matter consisted of tiny, indivisible particles.