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Johann Dobereiner notices atomic weight of strontium was halfway between calcium and barium. (14h 22min, jan 14, 1817 y – 0h 57min, jan 20, 1818 y)

Description:

Elements also had similar chemical properties

Added to timeline:

26 Dec 2017
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264
History of the Periodic Table

Date:

14h 22min, jan 14, 1817 y
0h 57min, jan 20, 1818 y
~ 1 years
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