DOBEREINER, JOHANN WOLFGANG

born Dec. 13, 1780, Hof an der Saale died March 24, 1849, Jena German chemist whose observation of similarities among certain elements anticipated the development of the periodic system of elements. As a coachman's son, Dbereiner had little opportunity for formal schooling, but he was apprenticed to an apothecary, read widely, and attended learned science lectures. Eventually he was able to attend the University of Jena, where he became an assistant professor (1810) and later was supervisor of science instruction. He was a lifelong friend of Johann Wolfgang von Goethe. During the 1820s Dbereiner'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 Dbereiner 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 sequencescalcium, strontium, barium; and sulfur, selenium, tellurium. 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. Dbereiner also discovered the organic compound furfural and developed the separation of calcium and magnesium.