state dobereiner laws of triads
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The group of three elements having similar properties.. the atomic weight of the middle elements is almost the arithmetic mean of the atomic weights of the other two ........
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This dates back to the pre periodic table era. Many of the elements were known and their atomic masses were calculated. Scientists were trying to sort elements w.r.t to the known propertierties. Johann Wolfgang Döbereiner noticed the sets of three elements with quantifiable atomic weight and densities.
In 1829, the German chemist Johann Wolfgang Döbereiner noted that there were groups of three elements (hence "triads") which had similar physical properties. He also noted that some 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 near exactly predicted by taking the arithmetic mean of values for that property of the other two elements.
This dates back to the pre periodic table era. Many of the elements were known and their atomic masses were calculated. Scientists were trying to sort elements w.r.t to the known propertierties. Johann Wolfgang Döbereiner noticed the sets of three elements with quantifiable atomic weight and densities.
In 1829, the German chemist Johann Wolfgang Döbereiner noted that there were groups of three elements (hence "triads") which had similar physical properties. He also noted that some 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 near exactly predicted by taking the arithmetic mean of values for that property of the other two elements.
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