Jöns Jacob Berzelius
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|J. J. Berzelius|
Jöns Jacob Berzelius (1779–1848)
20 August 1779|
Väversunda, Östergötland, Sweden
|Died||7 August 1848
|Alma mater||Uppsala University|
|Doctoral advisor||Johann Afzelius|
|Doctoral students||James Finlay Weir Johnston
|Known for||Atomic weights
|Notable awards||Copley medal (1836)|
Jöns Jacob Berzelius (Swedish: [jœns ˌjɑːkɔb bæɹˈseːliɵs]; 20 August 1779 – 7 August 1848) was a Swedish chemist. Berzelius is considered, along with Robert Boyle, John Dalton, and Antoine Lavoisier, to be one of the founders of modern chemistry.
Berzelius began his career as a physician but his researches in physical chemistry were of lasting significance in the development of the subject. He is especially noted for his determination of atomic weights; his experiments led to a more complete depiction of the principles of stoichiometry, or the field of chemical combining proportions. In 1803 Berzelius demonstrated the power of an electrochemical cell to decompose chemicals into pairs of electrically opposite constituents.
Berzelius's work with atomic weights and his theory of electrochemical dualism led to his development of a modern system of chemical formula notation that could portray the composition of any compound both qualitatively (by showing its electrochemically opposing ingredients) and quantitatively (by showing the proportions in which the ingredients were united). His system abbreviated the Latin names of the elements with one or two letters and applied superscripts to designate the number of atoms of each element present in both the acidic and basic ingredients.
Berzelius himself discovered and isolated several new elements, including cerium (1803) and thorium (1828). Berzelius’s interest in mineralogy also fostered his analysis and preparation of new compounds of these and other elements. He was a strict empiricist and insisted that any new theory be consistent with the sum of chemical knowledge. He developed classical analytical techniques, and investigated isomerism and catalysis, phenomena that owe their names to him. He became a member of the Royal Swedish Academy of Sciences in 1808 and served from 1818 as its principal functionary, the perpetual secretary. He is known in Sweden as "the Father of Swedish Chemistry". Berzelius Day is celebrated on 20 August in honour of him.
Born at Väversunda in Östergötland in Sweden, Berzelius lost both his parents at an early age. Relatives in Linköping took care of him, and there he attended the school today known as Katedralskolan. He then enrolled at Uppsala University where he learned the profession of medical doctor from 1796 to 1801; Anders Gustaf Ekeberg, the discoverer of tantalum, taught him chemistry. He worked as an apprentice in a pharmacy and with a physician in the Medevi mineral springs. During this time he conducted analysis of the spring water. For his medical studies he examined the influence of galvanic current on several diseases and graduated as M.D. in 1802. He worked as physician near Stockholm until the mine-owner Wilhelm Hisinger discovered his analytical abilities and provided him with a laboratory. Between 1808 and 1836, Berzelius worked together with Anna Sundström, who acted as his assistant.
In 1807 Berzelius was appointed professor in chemistry and pharmacy at the Karolinska Institute.
In 1808, he was elected a member of the Royal Swedish Academy of Sciences. At this time, the Academy had been stagnating for several years, since the era of romanticism in Sweden had led to less interest in the sciences. In 1818, Berzelius was elected the Academy's secretary, and held the post until 1848. During Berzelius' tenure, he is credited with revitalising the Academy and bringing it into a second golden era (the first being the astronomer Pehr Wilhelm Wargentin's period as secretary from 1749 to 1783). He was elected a Foreign Honorary Member of the American Academy of Arts and Sciences in 1822. In 1837, he was elected a member of the Swedish Academy, on chair number 5.
Law of definite proportions
Not long after arriving to Stockholm he wrote a chemistry textbook for his medical students, from which point a long and fruitful career in chemistry began. In 1818 he compiled a table of relative atomic weights, where oxygen was set to 100, and which included all of the elements known at the time. This work provided evidence in favour of the atomic theory proposed by John Dalton: that inorganic chemical compounds are composed of atoms combined in whole number amounts. In discovering that atomic weights are not integer multiples of the weight of hydrogen, Berzelius also disproved Prout's hypothesis that elements are built up from atoms of hydrogen.
In order to aid his experiments, he developed a system of chemical notation in which the elements were given simple written labels—such as O for oxygen, or Fe for iron—with proportions noted by numbers. This is the same system used today, the only difference being that instead of the subscript number used today (e.g., H2O), Berzelius used a superscript (H2O).
Discovery of elements
New chemical terms
Berzelius is also credited with originating the chemical terms "catalysis," "polymer," "isomer," and "allotrope," although his original definitions differ dramatically from modern usage. For example, he coined the term "polymer" in 1833 to describe organic compounds which shared identical empirical formulas but which differed in overall molecular weight, the larger of the compounds being described as "polymers" of the smallest. By this long superseded, pre-structural definition, glucose (C6H12O6) was viewed as a polymer of formaldehyde (CH2O). Berzelius also developed electrochemical dualism.
Berzelius had an effect on biology as well. He was the first person to make the distinction between organic compounds (those containing carbon), and inorganic compounds. In particular, he advised Gerardus Johannes Mulder in his elemental analyses of organic compounds such as coffee, tea, and various proteins. The term protein itself was coined by Berzelius, after Mulder observed that all proteins seemed to have the same empirical formula and came to the erroneous conclusion that they might be composed of a single type of very large molecule. Berzelius proposed the name because the aterial seemed to be tahe primitive substance of animal nutrition that plants prepare for the herbivores.
Vital force theory
In 1815 Berzelius propounded the vital force theory. Vital force theory described the mechanism of organic compound formation. It states that the organic compounds are naturally formed and their synthesis is only possible from living plants and animals by means of some mysterious force called the vital force and organic compounds could not be prepared in laboratory using inorganic compounds. However, this hypothetical model of vital force theory came to an end in 1828 when Friedrich Wohler accidentally obtained urea, an organic compound, by heating ammonium cyanate. After the synthesis of urea various other organic compounds were synthesized in the laboratory. For example, Kolbe prepared acetic acid in 1884, Hennel synthesized ethyl alcohol in 1828 and Berthelot obtained methane in 1856. Thus, the concept of vital force theory was completely rejected.
Relations with other scientists
After denying that chlorine is an element (which was proposed by Humphry Davy in 1810) for quite some time, the dispute was ended by the finding of iodine in 1812.
In 1818 Berzelius was ennobled by King Carl XIV Johan; in 1835, at the age of 56, he married Elisabeth Poppius, the 24-year-old daughter of a Swedish cabinet minister, and in the same year was elevated to friherre.
Berzeliusskolan, a school situated next to his alma mater, Katedralskolan, is named for him. In 1939 his portrait appeared on a series of postage stamps commemorating the bicentenary of the founding of the Swedish Academy of Sciences.
He died on 7 August 1848 at his home in Stockholm, where he had lived since 1806.
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- Paul Walden (1947). "Zum 100. Todestag von Jöns Jakob Berzelius am 7. August 1948". Zeitschrift Naturwissenschaften 34 (11): 321–327. Bibcode:1947NW.....34..321W. doi:10.1007/BF00644137.
- Holmberg, Arne (1933) Bibliografi över J. J. Berzelius. 2 parts in 5 vol. Stockholm: Kungl. Svenska Vetenskapsakademien, 1933–67. 1. del och suppl. 1–2. Tryckta arbeten av och om Berzelius. 2. del och suppl. Manuskript
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- Partington, J. R. (1964) History of Chemistry; vol. 4. London: Macmillan; pp. 142–77
|Wikisource has the text of a 1911 Encyclopædia Britannica article about Jöns Jacob Berzelius.|
|Wikimedia Commons has media related to Jöns Jacob Berzelius.|
- List of works by Berzelius (301 items as of access date 2011-12-29)
- Online works at Project Runeberg (Latin)
- Works by Jöns Jacob Berzelius at Project Gutenberg (Latin)
- Online correspondence between Berzelius and Sir Humphry Davy on Wikisource (English) (French)
- Online works on Gallica (French) (Swedish) (27 items as of access date 2011-12-29)
- Nordisk familjebok (1905), band 3, s. 90–96 (Swedish)
- Poliakoff, Martyn. Jöns Jacob Berzelius. University of Nottingham: The Periodic Table of Videos.
- Digital edition of "Lehrbuch der Chemie" 1823/1824 by the University and State Library Düsseldorf
- Digital edition of "Das saidschitzer Bitterwasser : chemisch untersucht" 1840 by the University and State Library Düsseldorf
- Digital edition of "Aus Jac. Berzelius' und Gustav Magnus' Briefwechsel in den Jahren 1828 - 1847" 1900 by the University and State Library Düsseldorf