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French sciencist, Antoine Lavoiseir compiled a list of all elements that were known. 33 elements organized in four catagories.
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Mid 1800s played a major role that led to the develpoment of many new chemistry, based industries.
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Brought an increase in number of know elements
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Newlands proposed an organizational scheme for the elements. Named it Law of Octaves.
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Meyer and Mendelev demonstrated a connection between mass and properties of elements. Mendelev was given more credit than Meyer because published his organizatiopnal scheme first.
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1870, over 100 elements created.
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In 1894, William Ramsay discovered the noble gases and realised that they represented a new group in the periodic table.
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In 1914, Henry Moseley 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
