Alexandre-Émile Béguyer de Chancourtois and the Order of the Chemical Elements

Alexandre-Emile Béguyer de Chancourtois (1820-1886)

Alexandre-Emile Béguyer de Chancourtois (1820-1886)

On January 20, 1820French geologist and mineralogist  Alexandre-Émile Béguyer de Chancourtois was born. De Chancourtois was the first to arrange the chemical elements in order of atomic weights in 1862. De Chancourtois only published his paper, but did not publish his actual graph with the irregular arrangement. Although his publication was significant, it was ignored by chemists as it was written in terms of geology. It was Dmitri Mendeleev’s table published in 1869 that became most recognized.[3]

Alexandre-Émile Béguyer de Chancourtois – Early Life

Born in Paris, France, the son of an architect, Alexandre-Émile Béguyer de Chancourtois entered France’s famous École Polytechnique at the age of 18 and was a student of Jean-Baptiste Élie de Beaumont, whose assistant he should become, as well as Pierre Guillaume Frédéric le Play, and metallurgist Ours-Pierre-Armand Petit-Dufrénoy. After completing the studies, de Chancourtois went on a biological expedition into Philippines, Luzon and Visayas, where he explored ore deposits and geology on behalf of his teachers. He joined the École Nationale Supérieure des Mines de Paris as professor of mine surveying. De Chancourtois was named the professor of geology at École Nationale Supérieure des Mines de Paris in 1852 and was awarded the Légion d’honneur by Napoleon III of France during the late 1860s. De Chancourtois led several overseas expeditions during the course of his life and served as the Inspector of Mines in Paris from 1875 until his death.

Further Activities

He supervised the collections of the École des Mines, was involved in geological maps from overseas and was subdirector of the service of the geological map of France and was also associated with Frédéric Le Play, whom he assisted in organizing the first World Exhibition in 1855 and for whom he produced industrial statistics. He proposed the creation of seismographic stations and improved safety in mines (ventilation and protection against explosions). In order to find a field of activity independent of his teachers, he turned to geography and made a long effort to introduce a geographical system (with a zero meridian in the Atlantic Ocean (meridian of Saint-Michel) and a metric system) independent of British dominance at the international level. But since the zero meridian required an observatory, Greenwich finally prevailed. Another equally unsuccessful project was the introduction of an international sound rewriting system in geography.

De Chancourtois's original organization of the elements

De Chancourtois’s original organization of the elements

Organizing the Chemical Elements

During the early 1860s and before John Alexander Reina Newlands, de Chancourtois created a new and unique system to organize the chemical elements. De Chancourtois’s proposed system was based on the newest values of atomic weights obtained by Stanislao Cannizzaro in 1858. He managed to devise a spiral graph that was arranged on a cylinder which he called vis tellurique, or telluric helix because tellurium was the element in the middle of the graph. De Chancourtois ordered the elements by increasing atomic weight and with similar elements lined up vertically.

De Chancourtois plotted the atomic weights on the surface of a cylinder with a circumference of 16 units, the approximate atomic weight of oxygen. The resulting helical curve, which de Chancourtois called a square circle triangle, brought similar elements onto corresponding points above or below one another on the cylinder. Alexandre-Émile Béguyer de Chancourtois became the first known scientist to see the periodicity of elements when they were arranged in order of their atomic weights. He saw that the similar elements occurred at regular atomic weight intervals. The English chemist John A. R. Newlands (1837-1898) described an octave rule as an octave periodicity of similar elements.

Later Life

However, de Chancourtois’ work, his publication attracted little attention from chemists around the world. He presented the paper to the French Academy of Sciences which published it in Comptes Rendus, the academy’s journal and the original diagram was left out of the publication, making the paper hard to comprehend. Only in 1869, Dmitri Mendeleyev‘s periodic table attracted attention and gained widespread scientific acceptance [3].Chancourtois became commander of the Legion of Honour (1867, already in 1856 he was its officer), became titular professor and Ingénieur général des mines. However, the post of subdirector of the service of the geological map of France was withdrawn from him in 1875.

Alexandre-Émile Béguyer de Chancourtois died in 1886 in Paris at age 66..

Catherine Drennan, 8. The Periodic Table and Periodic Trends, [8]

References and Further Reading:

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