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1 Jan 1829 Jahr - Döbereiner Developed 'triads', groups of 3 elements with similar properties. Lithium, sodium and potassium formed a triad. Calcium, strontium and barium formed a triad. Chlorine, bromine and iodine formed a triad.

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Contributions to Periodic table

BySamuel Benjamin
13 Feb 2020

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1 Jan 1829 Jahr
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~ 195 years ago
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