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jan 1, 1869 - 1869 - Russian chemist Dmitri Mendeleev started the development of the periodic table, arranging chemical elements by atomic mass. He predicted the discovery of other elements, and left spaces open in his periodic table for them. ←Dmitri Mendeleev

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History of the Periodic table

ByNathan GREEN
2 Dec 2017
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jan 1, 1869
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~ 157 years ago

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