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may 24, 1865 - Law of Octaves (Newlands)

Description:

He proposed his "law of octaves" in 1864 which organized the known elements into a table, not by the amount of protons they had, but by their mass.
The pattern was the atomic masses of the element, and atomic weights

Added to timeline:

Date:

may 24, 1865
Now
~ 160 years ago