Adapted from an image by Schmidt, Weimar (public domain), via Wikimedia Commons.
1780–1849
Johann Wolfgang Döbereiner
Noticed in 1829 that elements fall into families of three, the triads, with the middle one's weight between the other two.
Their table
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Where the dates and stories on this page come from; each event on the timeline links to its own source.
- Johann Wolfgang DöbereinerEncyclopaedia Britannica
- Johann Wolfgang DöbereinerWikipedia