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Ionic Radii03:10

Ionic Radii

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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...
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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
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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
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Aldol condensation is an acid or base-catalyzed condensation between aldehydes or ketones to give an α,ꞵ-unsaturated carbonyl compound. A base-promoted condensation between ester molecules to produce a ꞵ-ketoester is known as the Claisen condensation. In the presence of a base, both reactions involve deprotonation of the acidic α hydrogen to produce the corresponding enolates. The nucleophilic enolates attack their respective nonenolized carbonyl compound forming a tetrahedral...
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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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Ionic Impurity in a Bose-Einstein Condensate at Submicrokelvin Temperatures.

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Researchers studied Rydberg atoms in a Bose-Einstein condensate, observing ion-atom interactions below microkelvin temperatures. This work explores quantum scattering of charged impurities and polaron physics.

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Area of Science:

  • Atomic physics
  • Quantum optics
  • Condensed matter physics

Background:

  • Rydberg atoms interact with quantum gases via electron-atom and ion-atom forces.
  • Electron-neutral interactions typically dominate, obscuring other effects.
  • Studying these interactions is key to understanding quantum phenomena.

Purpose of the Study:

  • To suppress electron-neutral interactions in Rydberg atom-Bose-Einstein condensate systems.
  • To investigate ion-atom interactions in a regime where Rydberg orbits are much larger than the condensate.
  • To provide evidence for ion-atom interaction at ultralow temperatures.

Main Methods:

  • Exciting Rydberg states with principal quantum numbers up to n=190.
  • Using a dense, tightly trapped, micron-sized Bose-Einstein condensate.
  • Performing detailed line shape analysis of the Rydberg excitation spectrum.

Main Results:

  • Successfully suppressed dominant electron-neutral interactions.
  • Observed clear evidence of ion-atom interaction at temperatures below a microkelvin.
  • Demonstrated a regime where Rydberg orbits significantly exceed the atomic sample size.

Conclusions:

  • Ion-atom interaction is observable in Rydberg atom-Bose-Einstein condensate systems under specific conditions.
  • The findings pave the way for exploring the quantum regime of ion-atom scattering.
  • This research opens avenues for studying charged quantum impurities and polaron physics.