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Julius Lothar Meyer (19 August 1830 – 11 April 1895) was a German
chemist A chemist (from Greek ''chēm(ía)'' alchemy; replacing ''chymist'' from Medieval Latin ''alchemist'') is a scientist trained in the study of chemistry. Chemists study the composition of matter and its properties. Chemists carefully describe th ...
. He was one of the pioneers in developing the earliest versions of the
periodic table The periodic table, also known as the periodic table of the (chemical) elements, is a rows and columns arrangement of the chemical elements. It is widely used in chemistry, physics, and other sciences, and is generally seen as an icon of ch ...
of the
chemical element A chemical element is a species of atoms that have a given number of protons in their atomic nucleus, nuclei, including the pure Chemical substance, substance consisting only of that species. Unlike chemical compounds, chemical elements canno ...
s. Russian chemist
Dmitri Mendeleev Dmitri Ivanovich Mendeleev (sometimes transliterated as Mendeleyev or Mendeleef) ( ; russian: links=no, Дмитрий Иванович Менделеев, tr. , ; 8 February Old_Style_and_New_Style_dates">O.S._27_January.html" ;"title="O ...
(his chief rival) and he had both worked with
Robert Bunsen Robert Wilhelm Eberhard Bunsen (; 30 March 1811 – 16 August 1899) was a German chemist. He investigated emission spectra of heated elements, and discovered caesium (in 1860) and rubidium (in 1861) with the physicist Gustav Kirchhoff. The Bu ...
. Meyer never used his first given name, and was known throughout his life simply as Lothar Meyer.


Career

Lothar Meyer was born in
Varel Varel () is a town in the district of Friesland, in Lower Saxony, Germany. It is situated near the Jade River and the Jade Bight, approximately south of Wilhelmshaven and north of Oldenburg. With a population of 23,984 (2020) it is the bigge ...
, Germany (then part of the
Duchy of Oldenburg The Duchy of Oldenburg (german: Herzogtum Oldenburg)—named after its capital, the town of Oldenburg—was a state in the north-west of present-day Germany. The counts of Oldenburg died out in 1667, after which it became a duchy until 1810, w ...
). He was the son of Friedrich August Meyer, a physician, and Anna Biermann. After attending the Altes Gymnasium in Oldenburg, he studied medicine at the
University of Zurich The University of Zürich (UZH, german: Universität Zürich) is a public research university located in the city of Zürich, Switzerland. It is the largest university in Switzerland, with its 28,000 enrolled students. It was founded in 1833 f ...
in 1851. Two years later, he studied at the
University of Würzburg The Julius Maximilian University of Würzburg (also referred to as the University of Würzburg, in German ''Julius-Maximilians-Universität Würzburg'') is a public research university in Würzburg, Germany. The University of Würzburg is one of ...
, where he studied
pathology Pathology is the study of the causes and effects of disease or injury. The word ''pathology'' also refers to the study of disease in general, incorporating a wide range of biology research fields and medical practices. However, when used in ...
, as a student of
Rudolf Virchow Rudolf Ludwig Carl Virchow (; or ; 13 October 18215 September 1902) was a German physician, anthropologist, pathologist, prehistorian, biologist, writer, editor, and politician. He is known as "the father of modern pathology" and as the founder ...
. At Zurich, he had studied under
Carl Ludwig Carl Friedrich Wilhelm Ludwig (; 29 December 1816 – 23 April 1895) was a German physician and physiologist. His work as both a researcher and teacher had a major influence on the understanding, methods and apparatus used in almost all branches ...
, which had prompted him to devote his attention to physiological chemistry. After graduating as a Doctor of Medicine from Würzburg in 1854, he went to the
University of Heidelberg } Heidelberg University, officially the Ruprecht Karl University of Heidelberg, (german: Ruprecht-Karls-Universität Heidelberg; la, Universitas Ruperto Carola Heidelbergensis) is a public research university in Heidelberg, Baden-Württemberg, ...
, where
Robert Bunsen Robert Wilhelm Eberhard Bunsen (; 30 March 1811 – 16 August 1899) was a German chemist. He investigated emission spectra of heated elements, and discovered caesium (in 1860) and rubidium (in 1861) with the physicist Gustav Kirchhoff. The Bu ...
held the chair of chemistry. In 1858, he received a Ph.D. in chemistry from the
University of Breslau A university () is an institution of higher (or tertiary) education and research which awards academic degrees in several academic disciplines. Universities typically offer both undergraduate and postgraduate programs. In the United States, th ...
with a thesis on the effects of
carbon monoxide Carbon monoxide ( chemical formula CO) is a colorless, poisonous, odorless, tasteless, flammable gas that is slightly less dense than air. Carbon monoxide consists of one carbon atom and one oxygen atom connected by a triple bond. It is the simpl ...
on the
blood Blood is a body fluid in the circulatory system of humans and other vertebrates that delivers necessary substances such as nutrients and oxygen to the cells, and transports metabolic waste products away from those same cells. Blood in the cir ...
. With this interest in the
physiology Physiology (; ) is the scientific study of functions and mechanisms in a living system. As a sub-discipline of biology, physiology focuses on how organisms, organ systems, individual organs, cells, and biomolecules carry out the chemic ...
of
respiration Respiration may refer to: Biology * Cellular respiration, the process in which nutrients are converted into useful energy in a cell ** Anaerobic respiration, cellular respiration without oxygen ** Maintenance respiration, the amount of cellul ...
, he had recognized that
oxygen Oxygen is the chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements ...
combines with the
hemoglobin Hemoglobin (haemoglobin BrE) (from the Greek word αἷμα, ''haîma'' 'blood' + Latin ''globus'' 'ball, sphere' + ''-in'') (), abbreviated Hb or Hgb, is the iron-containing oxygen-transport metalloprotein present in red blood cells (erythroc ...
in blood. Influenced by the mathematical teaching of
Gustav Kirchhoff Gustav Robert Kirchhoff (; 12 March 1824 – 17 October 1887) was a German physicist who contributed to the fundamental understanding of electrical circuits, spectroscopy, and the emission of black-body radiation by heated objects. He ...
, he took up the study of mathematical physics at the University of
Königsberg Königsberg (, ) was the historic Prussian city that is now Kaliningrad, Russia. Königsberg was founded in 1255 on the site of the ancient Old Prussian settlement ''Twangste'' by the Teutonic Knights during the Northern Crusades, and was ...
under
Franz Ernst Neumann Franz Ernst Neumann (11 September 1798 – 23 May 1895) was a German mineralogist, physicist and mathematician. Biography Neumann was born in Joachimsthal, Margraviate of Brandenburg, near Berlin. In 1815 he interrupted his studies at Berlin ...
and in 1859, after having received his
habilitation Habilitation is the highest university degree, or the procedure by which it is achieved, in many European countries. The candidate fulfills a university's set criteria of excellence in research, teaching and further education, usually including ...
(certification for university teaching), became ''
Privatdozent ''Privatdozent'' (for men) or ''Privatdozentin'' (for women), abbreviated PD, P.D. or Priv.-Doz., is an academic title conferred at some European universities, especially in German-speaking countries, to someone who holds certain formal qualific ...
'' in physics and chemistry at the University of Breslau. In 1866, Meyer accepted a post at the
Eberswalde Forestry Academy The Eberswalde University for Sustainable Development (german: Hochschule für nachhaltige Entwicklung Eberswalde, literally ''University for Sustainable Development''; abbreviated in German as ''HNE Eberswalde'' or ''HNEE'') is a Fachhochschule i ...
at Neustadt-Eberswalde but two years later was appointed to a professorship at the
Karlsruhe Polytechnic The Karlsruhe Institute of Technology (KIT; german: Karlsruher Institut für Technologie) is a public research university in Karlsruhe, Germany. The institute is a national research center of the Helmholtz Association. KIT was created in 2009 ...
. In 1872, Meyer was the first to suggest that the six
carbon Carbon () is a chemical element with the symbol C and atomic number 6. It is nonmetallic and tetravalent—its atom making four electrons available to form covalent chemical bonds. It belongs to group 14 of the periodic table. Carbon ma ...
atoms in the
benzene Benzene is an organic chemical compound with the molecular formula C6H6. The benzene molecule is composed of six carbon atoms joined in a planar ring with one hydrogen atom attached to each. Because it contains only carbon and hydrogen atoms ...
ring (that had been proposed a few years earlier by August Kekulé) were interconnected by single bonds only, the fourth valence of each carbon atom being directed toward the interior of the ring. During the Franco-Prussian War, the Polytechnic was used as a hospital and Meyer took an active role in the care of the wounded. In 1876, Meyer became Professor of Chemistry at the
University of Tübingen The University of Tübingen, officially the Eberhard Karl University of Tübingen (german: Eberhard Karls Universität Tübingen; la, Universitas Eberhardina Carolina), is a public research university located in the city of Tübingen, Baden-W� ...
, where he served until his death from a
stroke A stroke is a disease, medical condition in which poor cerebral circulation, blood flow to the brain causes cell death. There are two main types of stroke: brain ischemia, ischemic, due to lack of blood flow, and intracranial hemorrhage, hemorr ...
on 11 April 1895 at the age of 64.


Periodic table

Meyer is best known for his part in the periodic classification of the elements. He noted, as John A. R. Newlands did in England, that if the elements were arranged in the order of their atomic weights, they fell into groups of similar chemical and physical properties repeated at periodic intervals. According to him, if the atomic weights were plotted as ordinates and the atomic volumes as abscissae—the curve obtained a series of maxima and minima—the most electro-positive elements appearing at the peaks of the curve in the order of their atomic weights. His book, ''Die modernen Theorien der Chemie'', which he began writing in Breslau in 1862 and which was published two years later, contained an early version of the periodic table containing 28 elements, classified elements into six families by their valence—for the first time, elements had been grouped according to their valence. Works on organizing the elements by
atomic weight Relative atomic mass (symbol: ''A''; sometimes abbreviated RAM or r.a.m.), also known by the deprecated synonym atomic weight, is a dimensionless physical quantity defined as the ratio of the average mass of atoms of a chemical element in a giv ...
, until then had been stymied by the widespread use of
equivalent weight In chemistry, equivalent weight (also known as gram equivalent) is the mass of one equivalent, that is the mass of a given substance which will combine with or displace a fixed quantity of another substance. The equivalent weight of an element i ...
s for the elements, rather than atomic weights. He published articles about classification table of the elements in horizontal form (1864) and vertical form (1870), in which the series of periods are properly ended by an element of the alkaline earth metal group.


Table of Meyer, 1864


Table of Meyer, 1870

In 1869,
Dmitri Mendeleev Dmitri Ivanovich Mendeleev (sometimes transliterated as Mendeleyev or Mendeleef) ( ; russian: links=no, Дмитрий Иванович Менделеев, tr. , ; 8 February Old_Style_and_New_Style_dates">O.S._27_January.html" ;"title="O ...
published a periodic table of all elements known at that time (he later predicted several new elements to complete the table, and corrected some atomic weights). A few months later, Meyer published a paper that included a revised version of his 1864 table that now included virtually all of the known elements, which was similar to the table published by Mendeleev:

Meyer had developed his fuller periodic table independently, but he acknowledged Mendeleev's priority. Included in Meyer's paper was a line chart of atomic volumes as a function of atomic weights, showing graphically the periodicity of the elements. Like Mendeleev, he also included predictions of future elements, but unlike Mendeleev did not emphasize these predictions nor suggest details of the physical and chemical properties of the future elements. In 1882, both Meyer and Mendeleev received the
Davy Medal The Davy Medal is awarded by the Royal Society of London "for an outstandingly important recent discovery in any branch of chemistry". Named after Humphry Davy, the medal is awarded with a monetary gift, initially of £1000 (currently £2000). H ...
from the
Royal Society The Royal Society, formally The Royal Society of London for Improving Natural Knowledge, is a learned society and the United Kingdom's national academy of sciences. The society fulfils a number of roles: promoting science and its benefits, re ...
in recognition of their work on the
Periodic Law Periodic trends are specific patterns that are present in the periodic table that illustrate different aspects of a certain element. They were discovered by the Russian chemist Dmitri Mendeleev in the year 1863. Major periodic trends include atom ...
. The mineral lotharmeyerite, , was discovered in 1983 and named in recognition of Meyer's work on the Periodic Law. The type locality is the
Ojuela Ojuela was a small mining settlement located northwest of the nearest town Mapimí, northwest. The settlement is now well known as a ghost town as a result of the ore being exhausted. Ojuela was established after the discovery of abandoned g ...
mine, Mapimí,
Durango Durango (), officially named Estado Libre y Soberano de Durango ( en, Free and Sovereign State of Durango; Tepehuán: ''Korian''; Nahuatl: ''Tepēhuahcān''), is one of the 31 states which make up the 32 Federal Entities of Mexico, situated in ...
,
Mexico Mexico (Spanish language, Spanish: México), officially the United Mexican States, is a List of sovereign states, country in the southern portion of North America. It is borders of Mexico, bordered to the north by the United States; to the so ...
. Four closely related minerals have been described since 1983: ferrilotharmeyerite, (1992); cobaltlotharmeyerite, (1997); nickellotharmeyerite, (1999); and manganlotharmeyerite, (2002).


Personal life

Meyer married Johanna Volkmann in 1866.


Tribute

On 19 August 2020,
Google Google LLC () is an American Multinational corporation, multinational technology company focusing on Search Engine, search engine technology, online advertising, cloud computing, software, computer software, quantum computing, e-commerce, ar ...
celebrated his 190th birthday with a
Google Doodle A Google Doodle is a special, temporary alteration of the logo on Google's homepages intended to commemorate holidays, events, achievements, and notable historical figures. The first Google Doodle honored the 1998 edition of the long-running an ...
.


See also

* Dimitri Mendeleev *
History of the periodic table The periodic table is an arrangement of the chemical elements, structured by their atomic number, electron configuration and recurring chemical properties. In the basic form, elements are presented in order of increasing atomic number, in the r ...


Notes


References

* * * Harald Kluge and Ingrid Kaestner, ''Ein Wegbereiter der physikalischen Chemie im 19. Jahrhundert, Julius Lothar Meyer (1830–1895)'' (Aachen: Shaker-Verlag, 2014). * Otto Kraetz, "Lothar Meyer," ''Neue Deutsche Biographie'', 17 (1994), 304–06.


External links

*
Periodic table according to Lothar Meyer (1870)


* ttp://www.meta-synthesis.com/webbook/35_pt/pt_database.php?Button=All The Internet Database of Periodic Tables. Chemogenesis web book.* {{DEFAULTSORT:Meyer, Lothar 1830 births 1895 deaths Corresponding members of the Saint Petersburg Academy of Sciences Eberswalde University for Sustainable Development faculty 19th-century German chemists Karlsruhe Institute of Technology faculty People from Oldenburg (state) People from Varel University of Tübingen faculty University of Würzburg alumni People involved with the periodic table