12 ч 38 мин, 17 фев 1869 г. - Dmitri Mendeleev - Periodic Table
Описание:
Mendeleev created a table that ordered all known elements based on their atomic weight, there was a recurring pattern of properties between the groups of elements.
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12 ч 38 мин, 17 фев 1869 г.
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~ 156 г назад