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The four element theory was proposed by Aristotle: Earth, Air, Fire and water.
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The idea of the atom where by the democritus and leucippus which is a indivisible particle that all matter is made of.
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Hydrogen was discovered as a colorless, odourless gas by Henry Cavendish.
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The first extensive list of elements was made by Antoine Lavoisier with 33 elements which was made up with metals and non-metals
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An early version of a periodic table which was made up with 28 element by Lothar Meyer.
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Dmitri Mendeleev produced a table with 66 known element in it. It was organized by atomic weight.
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Noble gases was discovered by William Ramsay.
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The atomic number of every element was made by Henry Moseley.