Does anyone know the ionic radius of hydride(anion of hydrogen)?

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Discussion Overview

The discussion centers around the ionic radius of the hydride ion (H-), exploring its properties in various compounds and comparing it to other ions. Participants express curiosity about the measurement and implications of the ionic radius in different contexts.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant inquires about the ionic radius of hydride, noting the difficulty in isolating hydride ions from their compounds.
  • Another participant provides internuclear distances in various compounds, indicating that these distances do not represent hydride ions directly.
  • A claim is made that the radius of hydride is nearly identical to that of hydrogen, suggesting minimal change due to electron interactions.
  • One participant references an analysis of alkali metal hydride crystal structures, proposing an average ionic radius of 1.3 angstroms for H-, comparable to that of an oxide ion.

Areas of Agreement / Disagreement

Participants express differing views on the ionic radius of hydride, with some focusing on its comparison to hydrogen and others discussing its measurement in specific compounds. The discussion remains unresolved regarding the exact value and implications of the ionic radius.

Contextual Notes

There are limitations in the discussion regarding the definitions of ionic radius and the context in which hydride is being considered, as well as the implications of electron-electron interactions.

edwin2b
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I come from Hong Kong and want to know the ans. THX very much!

Also curious to know, which nationality will browse this forum most?
 
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In which compound? As I'm sure you aware, you cannot really get get hydride by itself, so the issue may be where the hydride stops and the counter ion starts.
 
In water the internuclear distance from the hydrogen ion to the oxygen atom is .965 angstroms. in Hydrogen sulfide it is 1.34 angstroms to the sulfur. In H2Se it is 1.47 and in H2Te it is 1.67.
 
schrodie said:
In water the internuclear distance from the hydrogen ion to the oxygen atom is .965 angstroms. in Hydrogen sulfide it is 1.34 angstroms to the sulfur. In H2Se it is 1.47 and in H2Te it is 1.67.

These are not hydride (H-).
 
The radius of hydride is practically identical to hydrogen. The second electron is in the same orbital.

The very slight change in radius due to the electron-electron interactions isn't going to be important. Ionic radii are a crude measure in any case.
 
A quick analysis of the alkali metal hydride crystal structures (and using the Shannon-Prewitt ionic radii for the metals) gives an average 1.3 angstrom (130 pm) radius for H-. Roughly about the same size as an oxide ion.
 

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