Johann Dobereiner
The Periodic Table Courtesy of Periodic Table of the Elements v. 4.0 by Kostas Tsigaridis (http://ptoe.move.to/). Johann Dobereiner. In 1829, elements into groups of 3 triads. similar chemical properties and physical properties. ( ex. Cl, Br, I and Ca, Sr, Ba). Model of triads.
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