1 янв 1820 г. - Dobereiner

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Dobereiner is swedish.
Found properties of bromine. Recalled comparable properties of matter (calcium, strontium, barium,sulfur, selenium, tellurium). “Dobereiner's triads were a group of three elements”.Also, how how the appearances and the reactions of each elements triads were similar between them, “showed that in each triad the mean of the lightest and heaviest atomic weights approximated the atomic weight of the middle element”. Finally, also discovered the relative atomic mass of the middle atomic element in each triad, and how their average was close to the relative atomic masses of each element

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