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...gapedia.de |year=2012 |accessdate=27 February 2012}}</ref> was a [[Germany|German]] [[chemist]]. He is best known for the development of the so-called [[Döbe ...topic/167249/Johann-Wolfgang-Dobereiner |title=Johann Wolfgang Dobereiner (German chemist) -- Britannica Online Encyclopedia |first= |last= |work=britannica. ...

...y” 3rd Ed, Pearson/Prentice Hall publisher, {{ISBN|0-13-035471-6}}.</ref> Chemists study symmetry to explain how [[crystal]]s are made up and how [[chemical r ...ange. Every molecule has this element. The identity symmetry element helps chemists use mathematical group theory. ...