Hydron (chemistry)

In chemistry, the hydron, informally called proton, is the cationic form of atomic hydrogen, represented with the symbol H+
. The general term "hydron", endorsed by the IUPAC, encompasses cations of hydrogen regardless of their isotopic composition: thus it refers collectively to protons (1H+) for the protium isotope, deuterons (2H+ or D+) for the deuterium isotope, and tritons (3H+ or T+) for the tritium isotope.

Hydron
Names
Systematic IUPAC name
Hydron (substitutive)
Hydrogen(1+) (additive)
Other names
Proton
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
KEGG
PubChem CID
UNII
  • InChI=1S/p+1 Y
    Key: GPRLSGONYQIRFK-UHFFFAOYSA-N Y
SMILES
  • [H+]
Properties
H+
Molar mass 1.007 g·mol−1
Thermochemistry
Std molar
entropy (S⦵298)
 108.95 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

Unlike most other ions, the hydron consists only of a bare atomic nucleus. The negatively charged counterpart of the hydron is the hydride anion, H−
.

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