Dobereiner law of triads was given in which year
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1829
In 1817, a letter reported Johann Wolfgang Döbereiner's observations of the alkaline earths; namely, that strontium had properties that were intermediate to those of calcium and barium. By 1829, Döbereiner had found other groups of three elements (hence "triads") whose physical properties were similarly related.
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Answer:
The law was given in 1817
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