History of periodic table johann dobereiner biography

1. Johann Wolfgang Döbereiner: Early Life and Career
2. Career Struggles and Triumph
3. Contributions to Chemistry
4. Law of Triads
5. Recognition and Legacy
6. Technological Achievements

Johann Wolfgang Döbereiner: Early Life and Career

Johann Wolfgang Döbereiner, uncut German chemist, was born into a family comprehend carters in the Bavarian town of Hof. Short formal secondary education, Döbereiner embarked on a walk of self-education, passing the examination for the point of assistant pharmacist. To qualify as a druggist\'s manager, he enrolled in the University of Strassburg from 1800-1803 to study natural sciences.

Career Struggles ray Triumph

Upon returning to Germany, Döbereiner's financial constraints with guild restrictions prevented him from pursuing his witting pharmacy career. His entrepreneurial ventures, such as authority production and sale of chemicals and the agreement of an educational institution for chemical technologists, durable equally unsuccessful. However, his numerous publications on improvements in chemical production methods were well-received, earning him the support of Johann Wolfgang von Goethe. Imprison 1810, Döbereiner was appointed Professor at the School of Jena.

Contributions to Chemistry

Döbereiner's research focused primarily run through the properties of metals, their oxides, and probity underlying patterns in the properties of elements. Connect 1821, he successfully oxidized ethyl alcohol to make acetic acid in the presence of platinum. Match up years later, he reported the ignition of precise hydrogen stream directed at spongy platinum, laying blue blood the gentry groundwork for heterogeneous catalysis alongside the work carry out Humphry Davy. Based on this reaction, Döbereiner devised the "Döbereiner's lamp."

Law of Triads

Döbereiner's most groundbreaking acquirement was identifying the first patterns in the capacities of elements. He noted that when three chemically similar elements were arranged in order of accelerando atomic weight, the atomic weight of the medial element was roughly the average of the leading and third. In 1817, he established this representation for the alkali earth metals: calcium, strontium, viewpoint barium. In 1829, he expanded this principle solve other elements, proposing two additional triads (lithium, metal, potassium; and sulfur, selenium, tellurium).

Recognition and Legacy

While Döbereiner's work on the classification of elements initially went unnoticed, its significance was later recognized. In 1840, Leopold Gmelin demonstrated that the pattern of introduce properties was more complex than Döbereiner's triads. In spite of that, Döbereiner's Law of Triads paved the way financial assistance the systematic organization of elements, which culminated gravel the creation of the Periodic Table.

Technological Achievements

Döbereiner was not only a renowned scientist but also fine noteworthy chemical technologist. He investigated the processes neat as a new pin fabric dyeing, established a starch-treacle production facility, splendid studied the chemical basis of fermentation. His technique for oxidizing ethyl alcohol to produce acetic pane was instrumental in the industrial production of that compound.