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The first to recognise the true elements
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had found that when gases chemically react, the volumes of both the reactants and the products are in simple ratios.
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he said that Atoms are featureless spheres. The only difference between different elements is their weight.
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he published his hypothesis that equal volumes of all gases contain equal numbers of molecules.
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Determined Atomic Weights Accurately
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“Triads” suggest an underlying pattern
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chemists from all over the world congregated in Karlsruhe.
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Mendeleév on his desk played and arranged pieces of paper,
listing elements with their respective atomic weights,
trying to find some order. -
Discovered the “modern” Periodic Table
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Boisbaudran discovers eka-aluminum
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Nilson discovers eka-boron
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Winkler discovers eka-silicon
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A new column is needed for the new element!
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Another gas discovered
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Two more gases discovered
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Brauner attempted to find order in the higher elements
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Discovered that radium decays through a series of steps, leading apparently to a new group of elements
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Moseley predicted the following elements were yet to be discovered:43, 61, 75, 85, 87
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Soddy conceived the idea of an “isotope"
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Promethium was discovered in an atomic pile in Oak Ridge, Tennessee
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