Encyclopedia Britannica
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Hydrogen ion | Definition, Charge, Formula, & Facts | Britannica
July 20, 1998 - In common usage, the term hydrogen ion is used to refer to the hydrogen ion present in water solutions, in which it exists as the combined molecule H+·H2O.
cationic form of atomic hydrogen (symbol H⁺), informally called "proton"
Factsheet
Names Systematic IUPAC name
Hydron (substitutive)
Hydrogen(1+) (additive)
Other names
Proton (Hydrogen-1 only)
Hydron (substitutive)
Hydrogen(1+) (additive)
Other names
Proton (Hydrogen-1 only)
Identifiers
CAS Number 12408-02-5 Y
Names Systematic IUPAC name
Hydron (substitutive)
Hydrogen(1+) (additive)
Other names
Proton (Hydrogen-1 only)
Hydron (substitutive)
Hydrogen(1+) (additive)
Other names
Proton (Hydrogen-1 only)
Identifiers
CAS Number 12408-02-5 Y
PubChem
pubchem.ncbi.nlm.nih.gov › compound › Hydrogen-cation
Hydrogen cation | H+ | CID 1038 - PubChem
Hydrogen cation | H+ | CID 1038 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more.
Videos
02:21
Ionic Charge for Hydrogen (H) - YouTube
The Hydronium Ion
02:37
H+ vs H3O+ (Hydrogen cation vs Hydronium ion) - YouTube
06:48
Hydronium Ion | Definition, Formula & Calculation - Video | Study.com
02:00
H+ Electron Configuration (Hydrogen Ion) - YouTube
05:15
Hydrogen Ions and Acidity - YouTube
What is the charge on a hydrogen ion (H⁺)?
A hydrogen ion (H⁺) has a positive charge of +1. This is because a neutral hydrogen atom, which has one proton (+1 charge) and one electron (-1 charge), loses its electron, leaving behind only the positively charged proton.
vedantu.com
vedantu.com › chemistry › hydrogen ion: meaning, formula & importance
Hydrogen Ion: Definition, Formula, Charge & Uses Explained
What is the main difference between a neutral hydrogen atom (H) and a hydrogen ion (H⁺)?
The main difference lies in their subatomic particles and overall charge. Hydrogen Atom (H): A neutral hydrogen atom consists of one proton in its nucleus and one electron orbiting it. It has no net charge and is a highly reactive free radical.Hydrogen Ion (H⁺): A hydrogen ion is formed when a neutral hydrogen atom loses its electron. It consists of only a proton, giving it a net positive charge of +1.
vedantu.com
vedantu.com › chemistry › hydrogen ion: meaning, formula & importance
Hydrogen Ion: Definition, Formula, Charge & Uses Explained
What is a hydrogen ion and what is its chemical symbol?
A hydrogen ion is the nucleus of a hydrogen atom that has lost its single electron. Because the nucleus of a common hydrogen isotope (protium) consists of only a single proton, the hydrogen ion is essentially a bare proton. Its chemical symbol is H⁺.
vedantu.com
vedantu.com › chemistry › hydrogen ion: meaning, formula & importance
Hydrogen Ion: Definition, Formula, Charge & Uses Explained
Watermatters
watermatters.ca › home › articles
Hydrogen: What’s the difference between H, H2, H+, H- and OH- ? - Watermatters
That is why Hydride ion (H-) has the minus sign distinguishing it from a regular Hydrogen atom (H). The two dots after the H means that this ion has two electrons instead of just one.
Wikipedia
en.wikipedia.org › wiki › Hydrogen_anion
Hydrogen anion - Wikipedia
September 18, 2025 - 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.
Pascal - Bioblast
wiki.oroboros.at › index.php › Hydrogen_ion
Hydrogen ion - Bioblast
It is convenient to summarize all these hydrated forms as H+. With respect to isotope differences, the generalized IUPAC term is 'hydron' (Bunnett, Jones 1988), which does not relate to ionic hydration species.
Merriam-Webster
merriam-webster.com › dictionary › hydrogen ion
HYDROGEN ION Definition & Meaning - Merriam-Webster
The meaning of HYDROGEN ION is the cation H+ of acids consisting of a hydrogen atom whose electron has been transferred to the anion of the acid.
Wikidoc
wikidoc.org › index.php › Hydrogen_ion
Hydrogen ion - wikidoc
Hydrogen ion is recommended by IUPAC as a general term for all ions of hydrogen and its isotopes.[1] Depending on the charge of the ion, two different classes can be distinguished: When hydrogen loses its electron, the following cations can be formed: Hydron: general name referring to the positive ...
VEDANTU
vedantu.com › chemistry › hydrogen ion: meaning, formula & importance
Hydrogen Ion: Definition, Formula, Charge & Uses Explained
6 days ago - The concentration of Hydrogen Ion lets us determine the concentration of acidity or alkaline structure of the ion. Let us understand this with the help of an example. The most common and relatable example would be water (H2O).
ChemSpider
chemspider.com › Chemical-Structure.1010.html
Hydrogen ion | H
Names and synonyms · H(+) Hydrogen ion [Wiki] Hydrogen(1+) [IUPAC name – generated by ACD/Name] Hydrogen(1+) [German] [IUPAC name – generated by ACD/Name] Hydrogène(1+) [French] [IUPAC name – generated by ACD/Name] hydron [Wiki] proton [Wiki] 12408-02-5 [RN] 215-605-7 [EINECS] anti-hydrogen ...
Wikipedia
en.wikipedia.org › wiki › Hydrogen_ion
Hydrogen ion - Wikipedia
July 28, 2025 - Hydride: general name referring to the negative ion of any hydrogen isotope (H−)
Oxford Reference
oxfordreference.com › display › 10.1093 › oi › authority.20110810105118244
Hydrogen ion - Oxford Reference
A hydrogen atom that has gained or lost an electron, and thus has an electric charge. The positive hydrogen ion, H+, has lost its only electron and therefore consists of a single proton. A nebula containing H+ ions is known as an H II region.
Quora
quora.com › What-is-a-hydrogen-ion
What is a hydrogen ion? - Quora
Answer (1 of 4): There are two broad types of hydrogen ions, one a positive cation, and the other a negative anion. The anion is probably easier to explain, being just an H atom with an extra electron added.
Chemistry LibreTexts
chem.libretexts.org › bookshelves › physical & theoretical chemistry › supplemental modules (physical and theoretical chemistry) › acids and bases › acids and bases in aqueous solutions
The Hydronium Ion - Chemistry LibreTexts
January 30, 2023 - Similarly, a hydroxide ion, which can be considered to be a “proton hole” in the water, serves as a landing point for a proton from another \(\ce{H2O}\) molecule, so that the OH– ion hops about in the same way.
Reddit
reddit.com › r/askscience › if h+ (hydrogen ion) called a "proton" does that mean they have the same size(mass) ?
r/askscience on Reddit: If H+ (Hydrogen Ion) called a "proton" does that mean they have the same size(mass) ?
November 21, 2014 -
We all know once a hydrogen loses it's only electron it becomes (H+) or Hydrogen Ion . Does it share the same chemical/physical properties with a proton or not? If not then what is in the hydrogen that makes it heavier than a proton ?
PubMed Central
pmc.ncbi.nlm.nih.gov › articles › PMC2946644
The Structure of the Hydrogen Ion (Haq+) in Water - PMC
Recent theory favors a kinetic description that blurs the distinction between these static structures. A distorted Eigen-type ion with one short O⋯O bond (the “special pair”) is the calculated energy minimum at short timescales.18,19 We now present experimental evidence that an adequate description of Haq+ requires formulation as an H(H2O)6+ ion.
Kiddle
kids.kiddle.co › Hydrogen_ion
Hydrogen ion facts for kids
Hydrogen atoms can also gain an extra electron. When this happens, they become negatively charged particles called anions. Hydride is a general name for any negative hydrogen ion (H−).
Chemistry LibreTexts
chem.libretexts.org › campus bookshelves › saint francis university › chem 113: human chemistry i (muíño) › 3: ionic compounds
3.11: H⁺ and OH⁻ Ions - An Introduction to Acids and Bases - Chemistry LibreTexts
August 8, 2022 - However, because you have just learned about ions and ionic compounds, it is worth pointing out two important ions that are used to identify and distinguish if a substance is acidic or basic; hydrogen ions, \(\ce{H^{+}}\), and hydroxide ions, ...
Human Metabolome Database
hmdb.ca › metabolites › HMDB0059597
Human Metabolome Database: Showing metabocard for Hydrogen Ion (HMDB0059597)
Lipoamide dehydrogenase is a component of the glycine cleavage system as well as of the alpha-ketoacid dehydrogenase complexes. Involved in the hyperactivation of spermatazoa during capacitation and in the spermatazoal acrosome reaction.
American Chemical Society
acs.org › molecule-of-the-week › archive › h › hydronium-ion.html
Hydronium ion - American Chemical Society
November 19, 2025 - All acidic aqueous solutions contain protonated water, known commonly as the hydronium ion (H3O+). Brønsted acids release one or more of their protons (hydrogen ions), which combine with water molecules.