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Describes his ideas of five states of matter
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Democritus asserted that there was an infinite number of atoms and that they were so small that their size could not be diminished.
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Published "The Proficience and Advancement of learning" which contained a description of the scientiic method
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Published "The Skeptical Chymist" which is a treatise on the distinction between chemistry and alchemy.
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Discovered Hydrogen
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Wrote first lit of elements which contained 33 elements and seperated them as metals and nonmetals.
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Developed a table of atomic weights & introduced letters to symbolize elements
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Arranged the known elemnts in order of atomic weights and observed similarities between some elements
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Develops the early version of the periodic table with 28 elements organized by valence
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Produced a table based on atomic weights but arranged 'periodically' with elements with similiar properties under each other. His periodic table included the 66 known elements organized by atomic weights
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Discovered the noble gases
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Isolated radium and polonium from pitchblende
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Discovered the source of radioactivity as decaying atoms
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determined the atomic number of each of the elements and modified the "Periodic Law"
