Question

dobereiner's arrangement of elements into triads not so successful​

Answer 1

Dobereiner's Triads

So Doberiener had clubbed Lithium (Li), Sodium (Na) and Potassium (K) together in a triad. The atomic weights of Li and K are 6.9 and 39. ... However, Dobereiner soon found out that this was not uniform across all elements, and so this system had very short-lived and limited success. plz mark me as brailiest

Answer 2

Answer:

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During the 1820s Döbereiner’s experiments with the ignition of hydrogen on contact with powdered platinum led the Swedish chemist J.J. Berzelius to develop the concept of catalysis. Toward the end of the decade Döbereiner found that the properties of bromine, a liquid, seem halfway between those of chlorine gas and the solid iodine. He recalled a comparable graduation of properties in two other sequences, i.e. calcium, strontium, barium; and sulfur, selenium, tellurium. Each of Dobereiner's triads was a group of three elements. The appearance and reactions of the elements in a triad were similar to each other. He showed that in each triad the mean of the lightest and heaviest atomic weights approximated the atomic weight of the middle element. But he could not substantiate his hypothesis with a sufficient number of triads, and his findings were regarded in his time as merely interesting curiosities.

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