Ion Size
Ion Size - Related Videos
02:54
Trends in Lattice Energy: Ion Size and Charge
0 Views •
2020
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process: Conventions Here, the convention is used where the ionic...
11:09
Online Size-exclusion and Ion-exchange Chromatography on a SAXS Beamline
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Cited by 40 •
2017
The determination of the solution structure of a protein by small angle X-ray scattering (SAXS) requires monodisperse samples. Here, we present two possibilities to ensure minimal delays between sample preparation and data acquisition: online size-exclusion chromatography (SEC) and online ion-exchange chromatography (IEC).
09:30
Focused Ion Beams
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2023
Source: Sina Shahbazmohamadi and Peiman Shahbeigi-Roodposhti-Roodposhti, School of Engineering, University of Connecticut, Storrs, CT As electron microscopes become more complex and widely used in research labs, it becomes more of a necessity to introduce their capabilities. Focused ion beam (FIB) is an instrument that can be employed in order to fabricate, trim, analyze and characterize materials on mico- and nano-scales in a wide variety of fields from nano-electronics to medicine. FIB...
11:45
Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
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Cited by 19 •
2017
This paper presents a microfabrication methodology for surface ion traps, as well as a detailed experimental procedure for trapping ytterbium ions in a room-temperature environment.
01:25
The Anchoring-and-Adjustment Heuristic
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2020
In order to make good decisions, we use our knowledge and our reasoning. Often, this knowledge and reasoning is sound and solid. However, sometimes, we are swayed by biases or by others manipulating a situation. For example, let’s say you and three friends wanted to rent a house and had a combined target budget of $1,600. The realtor shows you only very run-down houses for $1,600 and then shows you a very nice house for $2,000. Might you ask each person to pay more in rent to get the $2,000...
FAQs
Electron loss can remove an entire outer shell, while electron gain increases repulsion within the occupied shells. These changes alter the balance between nuclear attraction and electron-electron repulsion, so a charged species does not simply retain its neutral atomic dimensions. The resulting size difference helps explain why cations and anions influence chemical interactions differently.
In an isoelectronic series, the compared ions have the same number of electrons, so electron-shell count is held constant. The ion with more protons attracts that shared electron population more strongly and therefore has the smaller radius. This comparison isolates nuclear charge as the key variable and provides a clear way to rank relative ion size.
Across related ions, additional occupied electron shells generally place outer electrons farther from the nucleus, increasing ionic radius. Within a common shell structure, increasing nuclear charge pulls electrons inward, reducing size. Considering both variables prevents oversimplified periodic comparisons, especially when ions differ in charge and electron configuration rather than belonging to a single straightforward sequence.
To compare ionic radii, first record each species’ charge and electron arrangement, then determine whether the ions share an isoelectronic configuration. Compare shell count before using nuclear charge: fewer occupied shells generally indicates a smaller ion, while greater nuclear charge contracts ions with the same electron count. This workflow produces a defensible qualitative ranking.
Ion size provides a structural comparison for interpreting solids. Relative radii help predict how oppositely charged ions arrange within crystal structures and how strongly the arrangement is associated with lattice energy. The same comparisons also inform assessments of bond character, linking microscopic dimensions with broader properties of ionic chemical substances.
In solution or coordination chemistry, comparing ion sizes helps anticipate which ions can participate in a given arrangement and how their interactions may differ. Size is not a complete prediction by itself, but it supplies a useful structural variable when interpreting coordination compounds, solubility patterns, and chemical reactivity.