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Antoine Lavoisier publishes a list of 33 elements ('simple substances'), this becomes the first collection of the elements. -
John Dalton provides a new list of the elements arranged by the relative weight of the substance
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He discovered that there are several groups of three elements that have relationships with each other. -
He published many periodic tables that represented the discovery of a fully mature system. He predicted on element correctly, an element that would weigh 44.5 (Scandium). -
Dmitri Mendeleev creates his version of the periodic table and successfully predicts four elements. He becomes the 'father of the periodic table. -
Radioactivity, the electron and x-rays are discovered, which explained why the elements fell into place on the periodic table. -
He publishes an explanation about why the elements fall into particular groups on the periodic table.
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He suggested that elements should also be based on number, and created the 'atomic number'.
