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jan 1, 1829 - 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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jan 1, 1829
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~ 196 years ago
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