Why Is the Gear of the Elemental Triads Locked In the history of the periodic table, Döbereiner's triads were an early endeavour to sort the elements into some logical gild and sets based on their physical properties. They are analogous to the groups (columns) on the modern periodic table. In 1817, a letter past Ferdinand Wurzer  [de] reported Johann Wolfgang Döbereiner's observations of the alkaline earths; namely, that strontium had properties that were intermediate to those of calcium and barium. [1] By 1829, Döbereiner had found other groups of 3 elements (hence "triads") whose physical properties were similarly related. [2] He also noted that some quantifiable properties of elements (e.k. diminutive weight and density) in a triad followed a trend whereby the value of the eye element in the triad would be exactly or nearly predicted

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