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
Encyclopedia Britannica
britannica.com › science › chemistry
Hydrogen ion | Definition, Charge, Formula, & Facts | Britannica
November 21, 2025 - The hydrogen nucleus is made up of a particle carrying a unit positive electric charge, called a proton. The isolated hydrogen ion, represented by the symbol H+, is therefore customarily used to represent a proton.
Watermatters
watermatters.ca › home › articles
Hydrogen: What’s the difference between H, H2, H+, H- and OH- ? - Watermatters
The extra electron means that H- is not a free radical however it is not stable because this form of hydrogen is a very strong base (extremely alkaline) which reacts with water to produce hydroxide (OH–and molecular hydrogen (H2). ... Hydride (H:– ) also reacts with metals to form chemical compounds which are reducing agents. ... Hydroxide (OH–) is also known as the hydroxyl ion.
What's the difference between a hydrogen ion and a regular proton?
A 1H+ ion is the same thing as a proton. More on reddit.com
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July 18, 2019How is the ion H- created?
Classical analogue: magnets attract each other. How come a magnet is attracted to a piece of iron, that in rest doesn't have a net magnetisation? The magnetic field induces a magnetic polarisation in the iron, whereafter it can be attracted. For an H atom, the charge distribution of the electron cloud is symmetric, but not in an external electric field. The free electron repels the bound electron, while it attracts the proton, creating an induced dipole moment. Then, the attraction to the proton is larger than the repulsion from the bound eletron. In general in multi-electronic atoms, the electrons are further apart than one would naively expect, this is both the result of Fermi-Dirac statistics and interelectronic repulsion. More on reddit.com
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April 5, 2021Ion dipole bonds vs H-Bonding
Ion-dipole interaction is not the same as ionic bonds, ion-dipole interaction is the interaction between charged solutes and polar solvents while ionic bonds are electrostatic attraction between ions. Think about the strength of the two interactions this way, in ion-dipole you have interaction between a full charge (or more) and the partial charge of the solvent while in H-bond you have interaction between two partial charges, which is stronger? What trend of ammonia are you referring to? More on reddit.com
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May 11, 2020Can H+ ions act as a reducing agent?
An H+ ion is a single proton, where does the extra positive charge come from for an H2+ ion? More on reddit.com
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November 1, 2022Videos
02:37
H+ vs H3O+ (Hydrogen cation vs Hydronium ion) - YouTube
02:21
Ionic Charge for Hydrogen (H) - YouTube
01:55
How to find Protons & Electrons for the H+ Ion - YouTube
02:00
H+ Electron Configuration (Hydrogen Ion) - YouTube
03:01
H+ Ion and Hydronium Ion - YouTube
40:58
Acids & Bases| Lesson 3: Hydrogen Ions & pH @EasyChemistry4all ...
Pascal - Bioblast
wiki.oroboros.at › index.php › Hydrogen_ion
Hydrogen ion - Bioblast
A hydrogen ion is a positively charged molecule. In particle physics, however, a proton is a submolecular and subatomic particle with a positive electric charge. The H+ ion has no electrons and is a bare charge with only about 1/64 000 of the ...
Chemistry LibreTexts
chem.libretexts.org › bookshelves › general chemistry › chemprime (moore et al.) › 11: reactions in aqueous solutions
11.5: Hydrogen and Hydroxide Ions - Chemistry LibreTexts
July 16, 2023 - The special case of a solution in which these two concentrations remain equal is called a neutral solution. A hydrogen ion, H+, is a hydrogen atom which has lost its single electron; that is, a hydrogen ion is just a proton.
Fiveable
fiveable.me › all key terms › anatomy and physiology i › hydrogen ion
Hydrogen ion Definition - Anatomy and Physiology I Key Term | Fiveable
A hydrogen ion, denoted as H^+, is a positively charged ion that plays a critical role in acid-base balance and various biochemical processes. It is created when a hydrogen atom loses its electron, resulting in a proton that can influence the pH of a solution.
Reddit
reddit.com › r/askscience › what's the difference between a hydrogen ion and a regular proton?
r/askscience on Reddit: What's the difference between a hydrogen ion and a regular proton?
July 18, 2019 - A hydrogen ion can also be a negatively charged ion called a hydride (H- ).
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.
Wikipedia
en.wikipedia.org › wiki › Hydrogen_ion
Hydrogen ion - Wikipedia
July 28, 2025 - Hydrogen forms the only cation that has no electrons, but even cations that (unlike hydrogen) still retain one or more electrons are still smaller than the neutral atoms or molecules from which they are derived. Hydrogen anions are formed when additional electrons are acquired: Hydride: general name referring to the negative ion of any hydrogen isotope (H−)...
Taylor & Francis
taylorandfrancis.com › knowledge › Engineering_and_technology › Chemical_engineering › Hydrogen_ions
Hydrogen ions - Knowledge and References | Taylor & Francis
A hydrogen ion is a positively charged hydrogen atom represented by the symbol H+. It is one of the two ions used to measure the acidity or basicity of a solution, the other being the hydroxyl ion represented by the symbol OH-. The pH scale ...
CK-12 Foundation
ck12.org › all subjects › chemistry › lewis acids and bases › what are h+ and oh- ions?
Flexi answers - What are H+ and OH- ions? | CK-12 Foundation
July 14, 2025 - H+ and OH- ions are ions that are important in chemistry, particularly in acid-base chemistry. H+ is a hydrogen ion. It is simply a hydrogen atom that has lost its only electron, leaving behind a proton. It is highly reactive and is a key player in many chemical reactions.
Human Metabolome Database
hmdb.ca › metabolites › HMDB0059597
Human Metabolome Database: Showing metabocard for Hydrogen Ion (HMDB0059597)
Catalyzes the transformation of the potent androgen dihydrotestosterone (DHT) into the less active form, 5-alpha-androstan-3-alpha,17-beta-diol (3-alpha-diol). Also has some 20-alpha-hydroxysteroid dehydrogenase activity.
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.
Fiveable
fiveable.me › all key terms › biological chemistry i › hydrogen ions (h)
Hydrogen ions (H+) Definition - Biological Chemistry I Key Term | Fiveable
Hydrogen ions (H+) are positively charged ions that play a crucial role in various biological and chemical processes, including cellular respiration and ATP synthesis. These ions are generated when hydrogen atoms lose their electrons, contributing to the acidity of solutions and participating ...
ScienceDirect
sciencedirect.com › topics › engineering › hydrogen-ion-concentration
Hydrogen Ion Concentration - an overview | ScienceDirect Topics
The significant influence of the hydrogen ion concentration on the properties of drilling fluids has long been recognized and has been the subject of numerous studies. Hydrogen ion concentration is more conveniently expressed as pH, which is the logarithm of the reciprocal of the hydrogen ion ...
Fiveable
fiveable.me › all key terms › anatomy and physiology i › hydrogen ions
Hydrogen Ions Definition - Anatomy and Physiology I Key Term | Fiveable
Hydrogen ions, also known as protons (H+), are subatomic particles that play a crucial role in various biological processes, including the transport of gases within the body. These positively charged ions are formed when a hydrogen atom loses its electron, and they are essential for maintaining ...
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.
VEDANTU
vedantu.com › chemistry › hydrogen ion: meaning, formula & importance
Hydrogen Ion: Definition, Formula, Charge & Uses Explained
1 day ago - A hydrogen ion is the nucleus of a hydrogen atom that has been isolated from its electron. A proton is a molecule with a unit of positive electric energy that makes the hydrogen nucleus.
Fiveable
library.fiveable.me › all key terms › anatomy and physiology i › hydrogen ion
Hydrogen ion - (Anatomy and Physiology I) - Vocab, Definition, Explanations | Fiveable | Fiveable
A hydrogen ion, denoted as H^+, is a positively charged ion that plays a critical role in acid-base balance and various biochemical processes. It is created when a hydrogen atom loses its electron, resulting in a proton that can influence the pH of a solution.
Medicine LibreTexts
med.libretexts.org › bookshelves › anatomy and physiology › book: acid-base physiology (brandis) › 1: introduction
1.3: The Hydrogen Ion - Medicine LibreTexts
December 31, 2021 - This is sometimes represented as H3O+ (the hydronium ion) but this one-to-one relationship is also inaccurate. Stewart suggests that the most accurate representation is {H:(H2O)n}+ to illustrate the reaction or interaction of H+ with water molecules. This would be extremely inconvenient to use clinically so we continue to speak of the hydrogen ion (H+) simply out of convenience.
Federal Aviation Administration
faa.gov › sites › faa.gov › files › data_research › research › med_humanfacs › oamtechreports › AM68-23.pdf pdf
A table for converting pH to hydrogen ion concentration [H+ ...
The Federal Aviation Administration is an operating mode of the U.S. Department of Transportation.