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Wrote the first extensive list of elements containing 33 elements
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Created triads which were groups of 3 elements with similar properties
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The known elements were arranged in order of atmoic weights
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Produced a table based on atomic weights but arranged periodically with elements with similar properties under each other.
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Compiled a period table of 56 elements based on the periodicity of propertires such as molar volume when arranged in atomic weight.
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Synthesised transuranic elements( the elements after uranium in the period table)
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