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Teachers’ misconception concerning valence and valency in chemistry

open access: diamondScience 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
doaj   +4 more sources

Neptunium Valence Chemistry in Anion Exchange Processing [PDF]

open access: green, 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
semanticscholar   +6 more sources

Valence and Core Photoelectron Spectra of Aqueous I3 from Multi-Reference Quantum Chemistry [PDF]

open access: goldMolecules, 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
doaj   +2 more sources

On the crystal chemistry of normal valence compounds [PDF]

open access: bronzeActa 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
openaire   +3 more sources

Interfacial chemistry and valence band offset between GaN and Al2O3 studied by X-ray photoelectron spectroscopy [PDF]

open access: green, 2013
The interface region between Ga-face n-type GaN and Al2O3 dielectric (achieved via atomic-layer deposition or ALD) is investigated by X-ray photoelectron spectroscopy (XPS).
Tianli Duan, Jisheng Pan, D. S. Ang
openalex   +2 more sources

Reactions in Crystalline Lattices: Chemistry of Lower Valence States of Lanthanides [PDF]

open access: greenThe Journal of Chemical Physics, 1970
Reduction of rare-earth (RE) ions to lower valence states in ionic crystals is described in terms of the equilibrium distribution theory for the (alkali halide):RE2+ and (alkaline-earth halide):RE3+ systems. Thermoluminescence glow curves of radiation-reduced CaF2:RE3+ systems reveal that the reoxidation of the divalent ions apparently occurs through ...
Fong, Francis K.   +2 more
openaire   +6 more sources

Anion chemistry enabled positive valence conversion to achieve a record high-voltage organic cathode for zinc batteries

open access: bronzeChem, 2022
Ze Chen   +9 more
openalex   +2 more sources

Nanoparticles of Low-Valence Vanadium Oxyhydroxides: Reaction Mechanisms and Polymorphism Control by Low-Temperature Aqueous Chemistry

open access: greenInorganic Chemistry, 2016
An aqueous synthetic route at 95 °C is developed to reach selectively three scarcely reported vanadium oxyhydroxides. Häggite V2O3(OH)2, Duttonite VO(OH)2, and Gain's hydrate V2O4(H2O)2 are obtained as nanowires, nanorods, and nanoribbons, with sizes 1 ...
Julie Besnardiere   +9 more
openalex   +3 more sources

Tuning electronic correlations in transition metal pnictides: Chemistry beyond the valence count [PDF]

open access: green, 2015
The effects of electron-electron correlations on the low-energy electronic structure and their relationship with unconventional superconductivity are central aspects in the research on iron-based pnictide superconductors.
Elia Razzoli   +16 more
openalex   +3 more sources

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