Meyer. Julius Lothar

Magnus, Albertus, 14 Marsden, Ernest, 39 Maxwell, James Clerk, 103 Mayow, John, 19 Mendeleev, Dmitri, 63, 64, 65 Meyer, Julius Lothar, 63 MUlikan, Robert Andrew, 37 MitscherUch, Edhardt, 205 Molina, Mario, 265, 266 Morehead, James T, 304 Morton, WiUiam T. I, 209 Moseley, Henry, 64 MuUer, Paul, 282, 283 MuUis, Kary B., 236... 

The closet precursor to Mendeleev s table in both chronological and philosophical toms was developed by Julius Lothar Meyer, a German chemist, in 1864. Although Meyer stressed physical rather than chemical properties, his table bears remarkable similarity to the one that Mendeleev would develop five years later. For a number of reasons, Meyer s prominence in tlte history books never matched Mendeleev s. There was an untimely delay in the publication of his most elaborate periodic table, and, perliaps more important, Meyer—unlike Mendeleev—hesitated to make predictions about unknown elements. 

In addition, ft is by no means cleer that successful predictions were in bcl so decisive in the acceptance of the periodic tabic by the sciunllfic community in Mmddecv s era. For example, the Davy medal, which predates the Nobel Prize as the highest accolade in chords-try was jointly awarded to Mendeleev and Julius Lothar Meyer his leading compellor, who dkt not make aery predictions. Indeed, there is not even a mention of Mendeleev s predictions in the published speech that accompanied the joint award of the Davy prize. It therefore scons dial this prize was awarded for the manner in which the... 

Our modem periodic table was developed independently in the late 1860s by Dimitri Mendeleev (Russian) and Julius Lothar Meyer (German). At that time, about 60 elements had been discovered, but nothing was known about atomic stracture. Lothar Meyer and Mendeleev had to work with elemental molar masses and other known elemental properties. 

New scientific methods (e.g. electrolysis) allowed the veteran elements to be joined stepwise by more and more unknown and unexpected substances that fulfilled the criteria for an element. In 1869, after many attempts to bring order into the growing chaos, Dimitri Mendeleev revealed a daring concept with his Periodic Table and its predictions. Each of the then known elements was assigned a place. The gaps represented elements that were not yet known. The discoveries of such elements proved that there was an order and system to the elements. This order explained much that was previously puzzling, for instance, the different atomic radii observed that same year by Julius Lothar Meyer, which seemed to follow a periodic trend. 

The designers of the lecture room were, of course, proved correct. Only a few years later a systematic order was, indeed, recognized. An extraordinary double discovery was made in 1869. The German chemist Julius Lothar Meyer (1830-1895) noticed a remarkable periodicity during his rigorous scientific analysis of the atomic weights and volumes. He remained content with only a mild curiosity in this realization, as his interests lay primarily in physicochemical problems. He was objective and driven only by facts he was wary of hypotheses... 

Very soon afterwards, however, two scientists independently produced the definitive statement on the classification of the elements - Julius Lothar Meyer (1830-95) in Germany and Dmitri Ivanovich Mendeleev (1834-1907) (also spelled Mendeleeff or Mendelejeff) in Russia. It is the latter who is now credited with the construction of the first periodic table. At the age of 35, Mendeleev was Professor of Chemistry at the University of St Petersberg, when he published his first paper (1869) on the periodic system. He was apparently unaware of the work of Newlands or Lothar Meyer, but came to the same conclusions, and was also prepared to go further, and predict that certain elements must remain to be discovered because of discrepancies in his table. Amongst other things, he concluded the following ... 

The periodic system of the elements was developed independently and almost simultaneously by Lothar Meyer in Germany and D. I. Mendeleev m Russia, Julius Lothar Meyer was bom on August 19, 1830, at Varel on... 

Julius) Lothar Meyer, 1830-1895. German chemist and physician. Professor of chemistry at Breslau and at Tubingen. Co-discoverer with Mendeleev of the periodic system of the elements. Some of his researches were on the gases of the blood, the molecular volumes of chemical compounds, atomic weights, a sensitive thermo-regulator, the paraffins, and the constitution of fuchsm. 

Two chemists in attendance at the Karlsruhe were Julius Lothar Meyer (1830-1895) and Dmitri Mendeleev (1834-1907). These two independently developed the periodic law and constructed their own versions of the periodic table. Meyer based his table primarily on the physical properties of the elements. Meyer plotted atomic volume against the atomic mass and noticed the periodicity in volumes of the elements. Other physical properties also showed periodic trends. Figure 6.2 shows how the melting point of the first fifty-five elements rises and falls in a roughly periodic fashion as atomic number increases. Based on his analysis, Meyer published his periodic table in 1870. 

Figure 8. Old Forest Academy building in Eberswalde, Germany, where Julius Lothar Meyer drafted his first comprehensive periodic table. (Photo Copyright J.

Figure 9. Columns in Varel, Germany, bearing sculpted heads of Julius Lothar Meyer, Dmitri Mendeleev, and Stanislao Cannizzaro. (Photo Copyright J. L. and... 

Reproduced by permission p. 82 Landfill with aluminum drum for mercury waste, photograph. Recio/Greenpeace. Reproduced by permission p. 83 Ritalin tablets, photograph. Photo Researchers, Inc. Reproduced by permission p. 85 Lothar von Meyer, Julius, photograph. Photo Researchers, Inc. Reproduced by permission p. 86 Millikan, Robert A., photograph. The Library of Congress p. 88 Stratas of banded liassic limestone and shale on a seacliff by... 

It can be mentioned here that another pioneer of the periodic system, the German Julius Lothar Meyer (1830-1895) did not list the rare earths in his first periodic table, because he was not convinced that the rare earths were genuine elements (van Spronsen, 1969). He also foimd that their atomic weights had not been determined with sufficient accuracy. 

Lothar Meyer, Julius. 1884. Die Modemen Theorien der Chemie. Breslau Auflage. 

Julius Lothar Meyer (1830-1895). German chemist. In addition to his contribution to die periodic table, Meyer also discovered the chemical affinity of hemoglobin for oxygen. 

A modern (and more complete) version of Julius Lothar Meyer s plot of atomic volume of the elements. He plotted the values against atomic weight here we have plotted them against atomic number, which is a more fundamental property. Note the periodic rise and fall of the values. 

On September 3, 1860 the Karlsruhe Conference convened in order to attempt to settle vexing issues pertaining to atoms, molecules, equivalents, nomenclature, and atomic weights. The clarity on atomic weights provided by Cannizzaro s 1858 pamphlet and presentations at the conference moved Julius Lothar Meyer to comment ... 

---