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Plato discoverers the term "Elements"
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Antoine Lavoisier wrote the first intensive list of the 33 discovered elements, they where sorted in metals and non-metals.
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Jakob Berzelius, Creates an Atomic Weight table and introduced letters and symbols for elements.
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Johann Dobereiner grouped elements with similar properties in to groups of three.
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John Newlands, arranged the known elements in order of atomic weights & observed similarities between some elements.
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Lothar Meyer develops an early version of the periodic table, with 28 elements.
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Dmitri Mendeleev, Made his Periodic table based on atomic weights, but organised them "periodically" elements that had the similar propertied where placed under each other. His table had 66 elements in it.
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William Ramsay Discovered noble gases.