Hydron

Hydron
Names
	Systematic IUPAC name Hydron (substitutive); Hydrogen(1+) (additive)
	Other names Proton
Identifiers
CAS Number	12408-02-5 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:15378;
ChemSpider	1010 ;
IUPHAR/BPS	2346;
KEGG	C00080 ;
PubChem CID	1038;
UNII	5046UKT60S ;
	InChI InChI=1S/p+1 Key: GPRLSGONYQIRFK-UHFFFAOYSA-N ;
	SMILES [H+];
Properties
Chemical formula	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

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 IUPAC, encompasses cations of hydrogen regardless of isotope: 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.

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⁻
.