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jan 1, 1869 - Development of the Periodic Table Begins

Description:

In 1869 Russian chemist Dimitri 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.

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Chemistry Honors Assignment

ByAYLOR LUSZCZEK
1 Oct 2018
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Date:

jan 1, 1869
Now
~ 157 years ago
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