This article is about the anion of hydrogen. For binary compounds of hydrogen with another element, see Hydride.
Negative ion of hydrogen
Hydrogen anion
Names
Systematic IUPAC name
Hydride[1]
Identifiers
CAS Number
12184-88-2
3D model (JSmol)
Interactive image
ChEBI
CHEBI:29239
ChemSpider
145831Y
Gmelin Reference
14911
PubChem CID
166653
CompTox Dashboard (EPA)
DTXSID6075306
InChI
InChI=1S/H/q-1Y
Key: KLGZELKXQMTEMM-UHFFFAOYSA-NY
SMILES
[H-]
Properties
Chemical formula
H−
Molar mass
1.009 g·mol−1
Conjugate acid
Dihydrogen
Thermochemistry
Std molar entropy (S⦵298)
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
Chemical compound
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.
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.
^"Hydride - PubChem Public Chemical Database". The PubChem Project. USA: National Center for Biotechnology Information.
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