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He wrote the first extensive list of elements containing 33 elements & distinguished between metals and non-metals
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He developed a table of atomic weights & introduced letters to symbolize elements
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A French geologist that listed the elements on paper tape and wound them,around a cylinder. Certain ‘threes’ of elements with similar properties came together down the cylinder. He called his model the ‘telluric screw’.
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He noticed that, if the elements were arranged in order of atomic weight, there was a periodic similarity with every 8 elements. He proposed his ‘law of octaves’ on this.
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complied a periodic table with 56 elements. wich were based on the regular repeating pattern of physical properties such as molar volume. the elements were arranged in order of increasing atomic weights.
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He produced a periodic table based on atomic weights but arranged ‘periodically’. Elements with similar properties appeared under each other.Gaps were left for yet to be discovered elements.
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He determined the atomic number of each of the known elements. He realised that, if the elements were arranged in order of increasing atomic number rather than atomic weight, they gave a better fit within the ‘periodic table’.
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He artificially produced heavy mass elements such as neptunium. These new elements were part of a new block of the periodic table called ‘actinides.
