A doberiner traid in the following
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Explanation:
The first of Dobereiner's triads was identified in the year 1817 and was constituted by the alkaline earth metals calcium, strontium and barium. Three more triads were identified by the year 1829. These triads are tabulated below.
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Triad 1.
Triad Atomic Masses
Lithium 6.94
Sodium 22.99
Potassium
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Explanation:
His arrangement in increasing order atomic mass and weight
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