Hydrogen anion

The hydrogen anion, H−, is a negative ion of hydrogen, that is, a hydrogen atom that has captured an extra electron. The hydrogen anion is an important constituent of the atmosphere of stars, such as the Sun. In chemistry, this ion is called hydride. The ion has two electrons bound by the electromagnetic force to a nucleus containing one proton.

This article is about the anion of hydrogen. For binary compounds of hydrogen with another element, see Hydride.
Hydrogen anion
Names
Systematic IUPAC name
Hydride
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
14911
  • InChI=1S/H/q-1 Y
    Key: KLGZELKXQMTEMM-UHFFFAOYSA-N Y
  • [H-]
Properties
H−
Molar mass 1.009 g·mol−1
Conjugate acid Dihydrogen
Thermochemistry
108.96 J K−1 mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

The binding energy of H− equals the binding energy of an extra electron to a hydrogen atom, called electron affinity of hydrogen. It is measured to be 0.754195(19) eV or 0.0277161(62) hartree (see Electron affinity (data page)). The total ground state energy thus becomes −14.359888 eV.

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