An example of Dobereiner's Law of Triads is of elements Oxygen , Carbon and Nitrogen in which the atomic weights of the middle elements was the average of the atomic weights of the other 2 elements , so the middle element is
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Döbereiner's triads were an early attempt to sort the elements into some logical order by their physical properties. It was discovered by reported Johann Wolfgang Döbereiner's in 1817.He also noted that quantifiable properties of elements (e.g. atomic weight and density) in a triad followed a trend whereby the value of the middle element in the triad would be exactly or nearly predicted by taking the arithmetic mean of values for that property of the other two elements.
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11th
Chemistry
Classification of Elements and Periodicity in Properties
Genesis of Periodic Classification
According to the law of tri...
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According to Dobereiner's law of triads, the properties of the middle element were in between those of the other two members. The elements were arranged in a group of three (called triads). The atomic weight of a middle element was almost the average of the other two. Three elements of the triad had similar chemical properties.