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 propertiesAdded to timeline:
Date:
14h 22min, jan 14, 1817 y
0h 57min, jan 20, 1818 y
~ 1 years