Identify the Dobereiners Triad. *
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Dobereiner's triads were groups of elements with similar properties that were identified by the German chemist Johann Wolfgang Dobereiner. ... The first of Dobereiner's triads was identified in the year 1817 and was constituted by the alkaline earth metals calcium, strontium, and barium.
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Dobereiner's triads are a group of three elements in which the atomic mass of the middle element is the mean of the atomic masses of the other two elements. For example, the atomic mass of Na is 23 which is the mean of the atomic masses of Li(7) and K(39).
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