Döbereiner was one of the first scientists to recognise that there is an existing pattern in elements. On 1828, Döbereiner found out that each group of elements regularly consist of three elements because they had similar chemical properties. When he arranged all the elements in order of increasing atomic mass, he called each group, a triad.
Döbereiner found three triads. The first triad consisted of chlorine, bromine and iodine. The rest included calcium, strontium and barium; the other of sulphur, selenium and tellurium.
Döbereiner’s discovery was at a dead end because other chemists attempted to find other triads but failed. As a result, scientists ignored his findings until Dmitri Ivanovich Mendeleev discovered the periodic law 40 years after.
Döbereiner found three triads. The first triad consisted of chlorine, bromine and iodine. The rest included calcium, strontium and barium; the other of sulphur, selenium and tellurium.
Döbereiner’s discovery was at a dead end because other chemists attempted to find other triads but failed. As a result, scientists ignored his findings until Dmitri Ivanovich Mendeleev discovered the periodic law 40 years after.
