Results 1 to 10 of about 50,397 (308)
Teachers’ misconception concerning valence and valency in chemistry
Science Education International, 2021 A study on the misconceptions developed or held by teachers related to the two terms valence and valency was undertaken. A total of 48 teachers (26 males and 22 females) teaching the chemistry component of science subject to 14- to 16-year-old students ...
Raghubir Singh Sindhu
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Valence and Core Photoelectron Spectra of Aqueous
Molecules, 2023 The I3− molecule is known to undergo substantial structural reorganization upon solvation by a protic solvent, e.g., water. However, the details of this process are still controversially discussed in the literature.
Vladislav Kochetov +4 more
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Neptunium Valence Chemistry in Anion Exchange Processing [PDF]
, 2003 The current anion resin in use in HB-Line Phase II, Reillex{trademark} HPQ, was tested in the laboratory under expected plant conditions for Np processing and was found to load between 50 and 70 g Np per liter of resin. Losses varied from 0.2 to 15 percent depending on a number of parameters. Hydrazine in the feed at 0.02 to 0.05 M appeared to keep the
E. Kyser
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On the crystal chemistry of normal valence compounds [PDF]
Acta Crystallographica, 1959 A new classification of the crystal structures of normal valence compounds with simple atomic ratios is discussed. This classification is based on two atomic parameters which gauge the directional properties of the bonds in a compound. The parameters are (1) the average principal quantum number, ~, of the valence shell of the component atoms and (2 ...
E. Mooser, W. B. Pearson
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INORGANIC CHEMISTRY: Valence and Spectra [PDF]
Nature Physical Science, 1971 openaire +2 more sources
Chemistry of Quarkbase Cosmology — I: Emergence of Atomic Valence
Chemistry of Quarkbase Cosmology — I: Emergence of Atomic Valence presents a foundational derivation of atomic valence within the Quarkbase Cosmology framework. The work shows that chemical structure arises as a geometric and dynamical consequence of stationary torsional modes of a continuous, frictionless Ψ-field, without invoking quantum-mechanical ...
Omeñaca Prado, Carlos
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Analysis of chemical structure and characteristics of building materials based on element chemistry [PDF]
E3S Web of Conferences, 2021 Elements in accordance with a certain proportion and spatial arrangement constitute the microstructure of the building materials, which lead to a specific property and function in the macro.
Yanlong Zhao +3 more
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UMA TRADUÇÃO COMENTADA DO ARTIGO “ÁCIDOS E BASES” DE GILBERT NEWTON LEWIS [PDF]
Química Nova, 2023 A COMMENTED TRANSLATION OF ACIDS AND BASES BY GILBERT NEWTON LEWIS. Gilbert Newton Lewis was a distinguished scientist in 20th century History of Chemistry.
Regiane Lopes dos Santos +3 more
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Understanding Periodic and Non-periodic Chemistry in Periodic Tables
Frontiers in Chemistry, 2021 The chemical elements are the “conserved principles” or “kernels” of chemistry that are retained when substances are altered. Comprehensive overviews of the chemistry of the elements and their compounds are needed in chemical science.
Changsu Cao +5 more
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RUDN Journal of Informatization in Education, 2020 Problem and purpose. Information and communication technologies (ICT) are considered one of the most progressive and effective means of increasing interest in learning, as well as developing students in modern teaching methods.
Vladimir I. Tomin
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