Results 201 to 210 of about 802,936 (223)

Refinement and extension of the table of standard energies for bonds containing atoms of the fourth group of the Periodic Table

Journal of Molecular Structure: THEOCHEM, 1994
The enthalpies of formation of a series of saturated and unsaturated closed-shell silicon-containing compounds have been calculated using various ab initio methods of quantum chemistry adapted to the size of the species under consideration. A large variety of bond energy terms involving the silicon, germanium or tin atom were derived from our ...
Georges Leroy, Claude Wilante, D.Riffi Temsamani   +2 more
openaire   +2 more sources

The periodic table: The 6d-5f mixed transition group

Journal of Chemical Education, 1952
With relatively few modifications, the Bohr-type periodic table presented by Glocker and Popov can be made to reflect more instructively the rather complex relationships obtained in the neighborhood of the 4f or gadolinium transition group and, more importantly, in the 6d-5f sequence extending from actinium through the region of uranium and the ...
openaire   +2 more sources

Oxide Adhesion on Periodic Table Group 4 and 5 Metals

1989
The oxide scale adhesion on Periodic Table group IV and V metals is evoked through two new concepts in high temperature corrosion: bistability and solute elastic effect.
D. Ciosmak, A. Sanfeld, G. Bertrand, J. P. Larpin, M. Lallemant   +4 more
openaire   +2 more sources

Thermal and thermodynamic data concerning the selenites from group IB in the periodic table

Thermochimica Acta, 1984
Abstract The thermal dehydration of CuSeO 3 ·2 H 2 O, and the thermal dissociation of CuSeO 3 and Ag 2 SeO 3 are studied. The mechanism of these processes is suggested. The heats of phase transitions and the specific heats of the corresponding compounds are determined.
G.G. Gospodinov, B.G. Bogdanov
openaire   +2 more sources

Groups and subgroups in the periodic table of the elements: A proposal of modification in the nomenclature

Journal of Chemical Education, 1980
A proposal to eliminate the "A" and "B" designations of subgroups and replace them with letters referring directly to the electronic structures of atoms.
openaire   +2 more sources

Thermal and thermodynamic properties of the selenites of the elements from group IV in the periodic table

Thermochimica Acta, 1989
Abstract The conditions necessary for the formation of basic lead selenites which result from the thermal dissociation of PbSeO 3 were investigated, as well as their thermodynamic properties.
B.G. Bogdanov, G.G. Gospodinov
openaire   +2 more sources

Electrical conductivity of polycrystals of nitrites of metals from the 1A group of the Periodic Table

Soviet Physics Journal, 1971
In the process of research [1], a study was made of electrical conductivity of polycrystals of the nitrites of lithium, sodium, potassium, rubidium, and cesium, as a function of temperature from −150 °C to their melting points: 222, 438, 283, 422, and 400 ° C, respectively.
L. G. Kolomin, P. I. Protsenko
openaire   +2 more sources

Gas chromatography of chlorides and bromides of III-, IV- and V-group elements in the periodic table [PDF]

Fresenius' Zeitschrift f�r Analytische Chemie, 1975
The theory for the relation between retention volume and boiling point in gas chromatography was applied to the retention volumes for bromides of IV- and chlorides and bromides of III- and V-group elements in the periodic table, as an extension of the previous paper on chlorides of IV-group elements.
Kiyoteru Otozai, Itiro Tohyama
openaire   +1 more source

Advances in polymerization catalysts based on 4 and 5F groups of periodic table

Inorganica Chimica Acta, 1984
Abstract So far, in the development of new catalyst systems, the attention of chemists has been customarily addressed to catalyst activity, regio and stereospecificity. Nowadays, the impact of catalyst systems on other aspects of a chemical process has to be taken in due account, in relation to the increased cost of raw materials and energy.
openaire   +2 more sources

Towards the periodic table of metallocorrolates: synthesis and characterization of main group metal complexes of octamethylcorrole

Inorganica Chimica Acta, 1990
[No abstract available]
PAOLESSE, ROBERTO, LICOCCIA, SILVIA, Boschi, T.   +2 more
openaire   +3 more sources