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The first to recognize true elements. (1743-1794)
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Found that when gases chemically react , the volumes of both the reactants and the products are in simple ratios. (1788-1850)
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In 1803 he revealed the concept of Dalton's Law of Partial Pressures. He formulated the Atomic Theory. (1766-1844)
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In 1811 he published his hypothesis that equal volumes of all gases contain equal number of molecules.(1776-1856)
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Determined atomic weights accurately. (1779-1848)
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Discovered the existence of families of elements with similar chemical properties.(1780-1849)
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Wrote a pamphlet which clearly distinguished atoms from molecules and allowed unequivocal working definition of atomic weight.
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Discovered the modern periodic table. (1830-1895)
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Discovered the modern periodic table with Lothar Meyer.
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Discovered eka-aluminum.
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Discovered eka-boron.(1840-1899)
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Discovered eka-silicon.(1838-904)
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Discovered Argon and Helium. (1852-1916)
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In 1902-1905 Rutherford discovered the radium decays through a series of steps, leading to a new group of elements. (1871-1937)
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From Moseley's work scientists now knew that there were 92 elements ranging from hydrogen to uranium.(1887-1915)
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Soddy conceived the idea of an Isotope. (1877-1956)
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Explained the behavior of transition elements and rare earth elements. (1885-1962)
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Suggested transuranium elements were a new series, akin to the rare earths. (1912-1999)
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The periodic table as it is today, with all the elements in their correct place.
