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in 330BC Aristotle contributed with the 4 element- fire, earth, water and air theory
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in 400BC the idea of a small particle, the atom was suggest by Democritus and Leucippus.
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wrote a list of 33 elements and told metals and no-metals apart
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Jakob Berzelius symbolized elements by using letters.
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johann dobereiner was the developer of the groups containing 3 elements each the 'triads' known for their similar properties.
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john newlands sorted the known elements into order of their atomic weights, he observed after.
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lothar meyer makes a version of the periodic table containing 28 elements.
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Dmitri Ivanovich Mendeleev was the cretaor of the first version of the periodic table. he predicted some unknown elements exsisted and their propeties.
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William Ramsay was the discoverer of the noble gases.
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henry moseley found out the atomic number for each of the elements and made changes to the periodic law.
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Synthesised the elements after uranium in the periodic table.
