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Democritus was an ancient Greek philosopher who is recognized for his atomic theories of the universe. Democritus was born in 460 BC and died about 90 years later. He discovered that atoms were the building blocks of everything and that they were comprised of mostly space. "nothing exists except atoms and empty space, everything else is just opinion."

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Born in 1766 John Dalton he was able to discover that Atoms in element were identical but different elements had different sized atoms by recognizing that atoms were building block. The English scientist was awarded the royal medal for his deeds. He died in 1844

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JJ Thompson is the scientist credited with the discovery of an electron. The electron was discovered by using the cathode ray tube experiment. The experiment works by Cathode ray tubes are sealed glass tubes from which most of the air has been evacuated. A high voltage is applied across two electrodes at one end of the tube, which causes a beam of particles to flow from the cathode and they used a magnet to see how the particles were charged and by using a positive magnet the found the negatively charged electron.

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Proposed by JJ Thomson in 1897. Won the Nobel prize in physics in 1906.

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Proposed by Ernest Rutherford in 1911, the model was based off of Thomson plum pudding experiments. Rutherford won a Nobel prize in chemistry in 1908.

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Proposed by Niels Bohr in 1913. Bohr won a noble prize in physics in 1922.

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Proposed by Erwin Schrödinger in 1926. Schrödinger won the Noble prize in physics in 1933.

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The neutron was discovered by James Chadwick by putting a piece of beryllium in a vacuum chamber with some polonium. The polonium emitted alpha rays, which struck the beryllium. When struck, the beryllium emitted the mysterious neutral rays which lead him to believe that his hypothesis of neutrons existing and adding to the mass of an atom.