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Ions and Ionic Charges

Ions and Ionic Charges

In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element — remains unchanged. Electrons, however, can be added to atoms by transfer from other atoms, lost by transfer to other atoms, or shared with other atoms. The transfer and sharing of electrons among atoms govern the chemistry of the elements. During the formation of some compounds, atoms gain or lose electrons to form electrically charged particles called...

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Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it is smaller than the atom from which it is derived. For example, the covalent radius of an aluminum atom (1s22s22p63s23p1) is 118 pm, whereas the ionic radius of an Al3+ (1s22s22p6) is 68 pm. As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear...

Ionic Bonds

Ionic Bonds

Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...

Molecular and Ionic Solids

Molecular and Ionic Solids

Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...

Ionic Bonding and Electron Transfer

Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.

Ionic Compounds: Formulas and Nomenclature

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An element composed of atoms that readily lose electrons (a metal) can react with an element composed of atoms that readily gain electrons (a nonmetal) to produce ions through complete electron transfer. The compound formed by this transfer is stabilized by the electrostatic attractions (ionic bonds) between the oppositely charged ions.

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Related Experiment Video

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Use of the Ramsay Assay to Measure Fluid Secretion and Ion Flux Rates in the Drosophila melanogaster Malpighian Tubule

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Describing screening in dense ionic fluids with a charge-frustrated Ising model.

Nicholas B Ludwig¹, Kinjal Dasbiswas¹, Dmitri V Talapin¹

¹The James Franck Institute, The University of Chicago, Chicago, Illinois 60615, USA.

The Journal of Chemical Physics

|November 3, 2018

Summary

Ionic fluid charge correlations exhibit unique effects beyond Debye-Hückel theory. A Coulomb or charge-frustrated Ising model reveals non-monotonic screening length dependence on temperature.

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Area of Science:

Physical Chemistry
Soft Matter Physics
Computational Chemistry

Background:

Classic Debye-Hückel theory fails to predict novel effects in dense ionic fluids, such as long-range screening and colloidal stabilization.
Understanding ionic correlations is crucial for explaining complex fluid behaviors.

Purpose of the Study:

To investigate ionic correlations in dense fluids using a Coulomb or charge-frustrated Ising model.
To explore the non-monotonic dependence of screening length on temperature.
To analyze the impact of short-range interactions on ionic correlations.

Main Methods:

Utilizing a Coulomb or charge-frustrated Ising model that incorporates both long-range Coulomb and short-range molecular interactions.
Employing mean-field theory approximations.
Conducting computational simulations.

Main Results:

The model successfully describes ionic correlations, including long-range screening and colloidal stabilization.
A non-monotonic relationship between screening length and temperature was observed at both mean-field and simulation levels.
The strength of short-range interactions was found to influence correlations across different regimes.

Conclusions:

The Coulomb or charge-frustrated Ising model provides a simplified yet effective description of ionic correlations in dense fluids.
The observed non-monotonic screening length dependence highlights limitations of classical theories.
Further research can explore the interplay of interaction strengths in complex ionic systems.