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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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2 Dec 2017
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History of the Periodic table

Date:

jan 1, 1869
Now
~ 155 years ago

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