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Recognised and named Oxygen and Hydrogen, predicted the existence of Silicon and proposed and then proved that Sulfur was an element and not a compound.
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Reported trends in selected groups of elements and that elements in those groups had similar atomic mass
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Proposed the classification of elements in terms of their atomic weights.
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First to organise a periodic table of elements in order of relative atomic mass
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Classified elements into six families by valence. Created the earlier version of the periodic table that was then improved by Mendeleev.
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Created a 'future' periodic table that predicted the undiscovered elements by looking at the properties of know elements
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Proposed that the periodic table should be sorted by atomic number rather than atomic mass.
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Discovered/co-discovered 10 elements. Also discovered more than 100 atomic isotopes for already discovered elements.
