Mendeleeff

The Davy Medal has been awarded to Dimitri Ivanovich Mendeleeff and Lothar Meyer. 

The reason why this distinction [two senses of "element"] has been so little noticed seems to be, on one hand, that the terms used by Mendeleeff are not very appropriate, and that, on the other hand, by coupling them to the pair of concepts, molecule and atom, he seems to have missed the essential point ([33], p 57). 

It was therefore not surprising that very contradictory results were obtained. Thus Mendeleeff and Kiripitscheff thought that pc steadily decreased with the pressure, whilst Amagat found that air obeyed Boyle s 2-0 law almost exactly at very low pressures. 

Classic popular account of great chemists Trevisan, Paracelsus, Avogadro, Mendeleeff, Curies, Thomson, Lawrence, up to A-bomb research, recent work with subatomic particles"... 

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 ... 

A remarkable property of the atomic weights was discovered, in the sixties, independently by Lothar Meyer and Mendeleeff. They found that the elements could be arranged in rows in the order of their atomic weights so that similar elements would be found in the same columns. A modernised form of the Periodic Table will be found on pp. 106, 107. It will be noticed, for example, that the "alkali" metals, Lithium, Sodium, Rubidium and Caesium, which... 

Note P. Tavernier did not say in his description in Ref 44, p 246, that Mendeleeff prepd, independently from Vieille, a NC contg 12.44%... 

N and named it Pirokolodion (Pyrocollodion), but said further that Lt Bernadou patented a single-base proplnt contg at first CP2 with 12.45% N and later pyrocollodion with N= 12.60%. All this is wrong. Lt Bernadou did not know the compn of French CP2, but he knew the compn of Mendeleeff s Pyrocollodion,... 

Note Dutton (Ref 58, p 154) stated that Russia rearmed its Army in 1896 with Mendeleeffs propellant and that this proplnt modified by Lt Bernadou was adopted in 1901 by the US Govt... 

Russian propints were based on Pyrocollodion of Mendeleeff. They contd 1% of DPhA stabilizer and were in the form of tubes... 

Kolbe gave each element a maximum valency beyond which combination was impossible, but which might not be completely exerted in the compounds of the element. Erlenmeyer and Mendeleeff adopted a somewhat similar view, and assumed that the higher oxygen compounds, with the exception of the peroxides, showed the maximum valency of the elements. 

W. Werner drew attention to the fact that the elements which show a tendency to form oxyfluorides occupy neighbouring positions in the periodic table of D. I. Mendeleeff, viz. 

T. Carnelley has further shown that if in a series of compounds A Xm, B Xm, C Xm,. .. in which A, B, C,. . . represent elements belonging to the same subgroup of Mendeleeff s Table, the colour passes wholly or partially through the series ... 

D. I. Mendeleeff noted that a mixture of equal volumes of chlorine, chlorine di-and tri-oxides has a density corresponding with the value observed by N. A. E. Millon, and therefore inferred that Millon s gas probably contains a mixture of approximately equal volumes of chlorine dioxide, C102, chlorine trioxide, C1203, and chlorine. There is, however, no unimpeachable evidence which justifies even this assumption and it is now suppposed that the existence of the chlorine trioxide, the anhydride of chlorous acid, has not been established. 

The complex nature of the process of decomposition of these acids and their behaviour on oxidation makes it difficult to decide which of the foregoing formulae are most satisfactory for the tetra- and pentathionic acids. In the case of dithionie and trithionic acids, the formulae given by Blomstrand and Mendeleeff and by Vogel appear to accord best with the general behaviour of the acids. 

MANY SCIENTISTS HAD NOTICED THAT IF YOU LINE UP THE ELEMENTS ACCORDING TO ATOMIC WEIGHTS, CERTAIN CHEMICAL TRAITS OCCUR PERIODICALLY. THE RUSSIAN SCIENTIST, DMITRI MENDELEEFF, ON THIS BASIS DISCOVERED THE PERIODIC LAW AND DEVELOPED THE PERIODIC TABLE. 

This synthesis of hydrazoic acid, said D. I. Mendeleeff, marks one of the most important achievements of the year 1890. This remarkable acid has no structural parallel among the inorganic acids, and in that respect it occupies an isolated position. The phenyl derivative of this acid, CflHg.N3, was discovered by J. P. Griess in 1867. 

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