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Atom of the element hydrogen
A hydrogen atom is an atom of the chemical element hydrogen. The electrically neutral hydrogen atom contains a single positively charged proton in the
Hydrogen_atom
Atoms with a single valence electron, so they behave like hydrogen
A hydrogen-like atom (or hydrogenic atom) is any atom or ion with a single electron. Examples of hydrogen-like atoms are H, He+, Li2+, Be3+ and so on,
Hydrogen-like_atom
Atoms composed of exotic particles
the hydrogen-4.1 atom can react with other atoms. Its chemical behavior is more like a hydrogen atom than an inert helium atom. A hadronic atom is an
Exotic_atom
Atomic model introduced by Niels Bohr in 1913
of the hydrogen atom, compared to the valence shell model. As a theory, it can be derived as a first-order approximation of the hydrogen atom using the
Bohr_model
Chemical reaction that swaps a hydrogen radical between two molecules
hydrogen atom abstraction, or hydrogen atom transfer (HAT), refers to a class of chemical reactions where a hydrogen free radical (a neutral hydrogen
Hydrogen_atom_abstraction
Smallest unit of a chemical element
Atoms are the basic particles of the chemical elements and the fundamental building blocks of matter. An atom consists of a nucleus of protons and generally
Atom
with 1 gram of hydrogen to make 8 grams of water. Dalton considered water to be a "binary atom", with one oxygen atom and one hydrogen atom, HO. He also
History_of_atomic_theory
Effect in quantum electrodynamics
an anomalous difference in energy between two electron orbitals in a hydrogen atom. The difference was not predicted by theory and it cannot be derived
Lamb_shift
Excited atomic quantum state with high principal quantum number (n)
that experienced by the electron in a hydrogen atom. In spite of its shortcomings, the Bohr model of the atom is useful in explaining these properties
Rydberg_atom
Chemical reaction between molecular hydrogen and another compound or element
reduce or saturate organic compounds. Hydrogenation typically constitutes the addition of pairs of hydrogen atoms to a molecule, often an alkene. Catalysts
Hydrogenation
Unit of length about the size of a hydrogen atom
and the electron in a hydrogen atom in its ground state. It is named after Niels Bohr, due to its role in the Bohr model of an atom. Its value is 5
Bohr_radius
Covalent chemical bond between hydrogen and carbon atoms
In chemistry, the carbon–hydrogen bond (C−H bond) is a chemical bond between carbon and hydrogen atoms that can be found in many organic compounds. This
Carbon–hydrogen_bond
Intermolecular attraction between a hydrogen donor-and-acceptor pair
occurs when a hydrogen (H) atom, covalently bonded to a more electronegative donor atom or group (Dn), interacts with another electronegative atom bearing a
Hydrogen_bond
Chemical element with atomic number 1 (H)
Emerging uses for hydrogen include the use of fuel cells to generate electricity. The ground state energy level of the electron in a hydrogen atom is −13.6 electronvolts (eV)
Hydrogen
Deep-red spectral line of hydrogen
Hydrogen-alpha, typically shortened to H-alpha or Hα, is a deep-red visible spectral line of the hydrogen atom with a wavelength of 656.28 nm in air and
Hydrogen-alpha
Details in the emission spectrum of an atom
non-relativistic Schrödinger equation. It was first measured precisely for the hydrogen atom by Albert A. Michelson and Edward W. Morley in 1887. The explanation
Fine_structure
Isotope of hydrogen with one neutron
Deuterium (hydrogen-2, symbol 2H or D, also known as heavy hydrogen) is one of two stable isotopes of hydrogen; the other is protium, or hydrogen-1, 1H. The
Deuterium
Energy needed to remove an electron
for the hydrogen atom. For hydrogen in the ground state Z = 1 {\displaystyle Z=1} and n = 1 {\displaystyle n=1} so that the energy of the atom before ionization
Ionization_energy
Hydrogen atom that has gained or lost an electron
A hydrogen ion is an ion created when a hydrogen atom loses or gains an electron. A positively charged hydrogen ion (or proton) can readily combine with
Hydrogen_ion
Chemical compound
Hydrogen polyoxides (also known as oxidanes, oxohydrogens, or oxyhydrogens) are chemical compounds that consist only of hydrogen and oxygen atoms, are
Hydrogen_polyoxide
Important atomic emission spectra
astronomical spectroscopy for detecting the presence of hydrogen and calculating red shifts. A hydrogen atom consists of a nucleus and an electron orbiting around
Hydrogen_spectral_series
Compact notation for chemical compounds
(twice as many hydrogen atoms as carbon and oxygen), while its molecular formula is C6H12O6 (12 hydrogen atoms, six carbon and oxygen atoms). Sometimes a
Chemical_formula
Spectral line of hydrogen state transition in UHF radio frequencies
created by a change in the energy state of solitary, electrically neutral hydrogen atoms. It is produced by a spin-flip transition, which means the direction
Hydrogen_line
Metal-Hydride Hydrogen Atom Transfer (MHAT) is a process where a metal hydride (M–H) transfers a hydrogen atom (H•) to an alkene, forming a carbon-centered
Metal-hydride hydrogen atom transfer
Metal-hydride_hydrogen_atom_transfer
Description of a quantum-mechanical system
discretized. The Schrödinger equation for the electron in a hydrogen atom (or a hydrogen-like atom) is E ψ = − ℏ 2 2 μ ∇ 2 ψ − q 2 4 π ε 0 r ψ {\displaystyle
Schrödinger_equation
Chemical compound
commonly given the formula HCl. Hydrogen chloride is a diatomic molecule, consisting of a hydrogen atom H and a chlorine atom Cl connected by a polar covalent
Hydrogen_chloride
Cosmological epoch c. 370,000 years after the Big Bang
electrons and protons first became bound to form electrically neutral hydrogen atoms. Recombination occurred about 378000 years after the Big Bang (at a
Recombination_(cosmology)
New Zealand physicist and chemist (1871–1937)
the emission of a subatomic particle that he initially called the "hydrogen atom", but later (more precisely) renamed the proton. He is also credited
Ernest_Rutherford
Device used as a frequency standard
A hydrogen maser, also known as hydrogen frequency standard, is a specific type of maser that uses the intrinsic properties of the hydrogen atom to serve
Hydrogen_maser
Chemical compound (OH–)
diatomic anion with chemical formula OH−. It consists of an oxygen and hydrogen atom held together by a single covalent bond, and carries a negative electric
Hydroxide
Simplified model in condensed matter physics
a 1D chain of hydrogen atoms, the 1s orbital forms a continuous band, which would be exactly half-full. The 1D chain of hydrogen atoms is thus predicted
Hubbard_model
Representation method in chemistry
labelled with another element. Labels are optional for carbon atoms, and the hydrogen atoms attached to them. An early form of this representation was first
Skeletal_formula
Function describing an electron in an atom
electron cloud of an atom may be seen as being built up (in approximation) in an electron configuration that is a product of simpler hydrogen-like atomic orbitals
Atomic_orbital
be observed. The state itself remains the same. In the case of the hydrogen atom (with the assumption that there is no spin-orbit coupling), the observables
Good_quantum_number
Predecessor to modern quantum mechanics (1900–1925)
the atom. In 1913, Bohr displayed rudiments of the later defined correspondence principle and used it to formulate a model of the hydrogen atom which
Old_quantum_theory
Physical constants of energy and wavenumber
symbol R ∞ {\displaystyle R_{\infty }} for heavy atoms or R H {\displaystyle R_{\text{H}}} for hydrogen, named after the Swedish physicist Johannes Rydberg
Rydberg_constant
Mathematical function used to approximate atomic orbitals in quantum chemistry
chemistry. A hydrogen-like atom or a hydrogenic atom is an atom with one electron. Except for the hydrogen atom itself (which is neutral), these atoms carry
1s_Slater-type_function
Quantum chemical model of molecular and condensed matter electronic systems
close proximity of two nonbonding atoms leads to destabilizing steric repulsion but in QTAIM the observed hydrogen-hydrogen interactions are in fact stabilizing
Atoms_in_molecules
Mathematical description of quantum state
Hydrogen-like atoms have very similar solutions. This solution does not take into account the spin of the electron. In the figure of the hydrogen orbitals
Wave_function
Exotic molecule consisting of a hydrogen atom bound to a positronium atom
Positronium hydride, or hydrogen positride is an exotic molecule consisting of a hydrogen atom bound to an exotic atom of positronium (the combination
Positronium_hydride
Prefix in organic chemistry nomenclature
applied to the hydrogen atoms attached to the carbon atoms. A hydrogen atom attached to an α-carbon is called an α-hydrogen, a hydrogen atom on the β-carbon
Locant
Number of protons found in the nucleus of an atom
was to be approximately equal to half of the atom's atomic weight, expressed in numbers of hydrogen atoms. This central charge would thus be approximately
Atomic_number
Description of physical properties at the atomic and subatomic scale
example, the elementary quantum model of the hydrogen atom describes the electric field of the hydrogen atom using a classical − e 2 / ( 4 π ϵ 0 r ) {\displaystyle
Quantum_mechanics
Clock that monitors the resonant frequency of atoms
atomic clock. Whereas a hydrogen atom moves at 1,600 m/s at room temperature and a nitrogen atom moves at 510 m/s, a caesium atom moves at a much slower
Atomic_clock
Chemical reaction
Hydrogen–deuterium exchange (also called H–D or H/D exchange) is a chemical reaction in which a covalently bonded hydrogen atom is replaced by a deuterium
Hydrogen–deuterium_exchange
Negative ion of hydrogen
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
Hydrogen_anion
Exotic particle made of an antiproton and positron
antimatter counterpart of hydrogen. Whereas the common hydrogen atom is composed of an electron and proton, the antihydrogen atom is made up of a positron
Antihydrogen
Vector used in astronomy
distance between them; such problems are called Kepler problems. Thus the hydrogen atom is a Kepler problem, since it comprises two charged particles interacting
Laplace–Runge–Lenz_vector
First modern model of the atom
that atoms are divisible, making reference to William Prout who in 1815 found that the atomic weights of various elements were multiples of hydrogen's atomic
Plum_pudding_model
Form of water
form of water in which hydrogen atoms are all deuterium (2 H or D, also known as heavy hydrogen) rather than the common hydrogen-1 isotope (1 H, also called
Heavy_water
Compound derived from an acid
compound derived from an acid (either organic or inorganic) in which the hydrogen atom (H) of at least one acidic hydroxyl group (−OH) of that acid is replaced
Ester
Beam Factory by bombarding hydrogen with helium-8 atoms; all six of the helium-8's neutrons were donated to the hydrogen nucleus. The two remaining protons
Isotopes_of_hydrogen
Hydrocarbon compound (C6H6)
six carbon atoms joined in a planar hexagonal ring with one hydrogen atom attached to each. As it contains only carbon and hydrogen atoms, benzene is
Benzene
Quantum number denoting orbital angular momentum
number ℓ and the following series. The wavelengths listed are for a hydrogen atom: n = 1 , L = 0 {\displaystyle n=1,L=0} , Lyman series (ultraviolet)
Azimuthal_quantum_number
as that of a hydrogen ion while having a mass over one thousand times less. Many such electrons were known to be associated with every atom. By 1904 Thomson
History_of_quantum_mechanics
Polyatomic anion
consists of one central carbon atom surrounded by three oxygen atoms in a trigonal planar arrangement, with a hydrogen atom attached to one of the oxygens
Bicarbonate
Scientific background leading to the discovery of subatomic particles
determined to be approximately integer multiples of the mass of the hydrogen atom, and the atomic number had been identified as the charge on the nucleus
Discovery_of_the_neutron
Void between celestial bodies
(ordinary) matter in the universe, having a number density of less than one hydrogen atom per cubic metre and a kinetic temperature of millions of kelvins. Local
Outer_space
Carbon atom bound to one other carbon in a molecule
case of an alkane, three hydrogen atoms are bound to a primary carbon (see propane in the figure on the right). A hydrogen atom could also be replaced by
Primary_carbon
Chemical compound with hydrogen and chalcogen atoms
Hydrogen chalcogenides (also chalcogen hydrides or hydrogen chalcides) are binary compounds of hydrogen with chalcogen atoms (elements of group 16: oxygen
Hydrogen_chalcogenide
Chemistry based on quantum physics
equation can only be obtained for the hydrogen atom (though exact solutions for the bound state energies of the hydrogen molecular ion within the B-O approximation
Quantum_chemistry
Molecular ion
quantum mechanics explaining forms of matter more complex than the hydrogen atom. The theoretical interest arises because an accurate mathematical description
Dihydrogen_cation
Physical and chemical properties of pure water
chemical formula H 2O; one molecule of water has two hydrogen atoms covalently bonded to a single oxygen atom. Water is a tasteless, odorless liquid at ambient
Properties_of_water
States of matter for water as a solid
tessellating hexagonal rings, with an oxygen atom on each vertex, and the edges of the rings formed by hydrogen bonds. The planes alternate in an ABAB pattern
Phases_of_ice
Quasiparticle which is a bound state of an electron and an electron hole
bound state is formed, akin to that of the electron and proton in a hydrogen atom or the electron and positron in positronium. Excitons are composite
Exciton
Chemical compound giving a proton or accepting an electron pair
non-aqueous solvents. A Brønsted–Lowry or Arrhenius acid usually contains a hydrogen atom bonded to a chemical structure that is still energetically favorable
Acid
Periodic recurrence of the quantum wave function
quantum well, harmonic oscillator, or hydrogen atom, while for shorter times are approximate for the hydrogen atom and many other quantum systems. Consider
Quantum_revival
Subatomic particle with positive charge
most common isotope of the hydrogen atom (with the chemical symbol "H") is a lone proton. The nuclei of the heavy hydrogen isotopes deuterium and tritium
Proton
Chemical compound
Ammonium is a modified form of ammonia that has an extra hydrogen atom. It is a positively charged (cationic) molecular ion with the chemical formula
Ammonium
Hydrocarbon compound (CH4) in natural gas
chemical compound that has the chemical formula CH4 (one carbon atom bonded to four hydrogen atoms). It is a group-14 hydride, the simplest alkane, and the main
Methane
Spin of an electron
and gS by quantum mechanics. See Landé g-factor for details. For a hydrogen atom, an electron occupying the atomic orbital Ψn,ℓ,m , the magnetic dipole
Electron_magnetic_moment
Type of saturated hydrocarbon compound
saturated hydrocarbon. In other words, an alkane consists of hydrogen and carbon atoms arranged in a tree structure in which all the carbon–carbon bonds
Alkane
Coordination complex containing an oxo ligand
P450 contains a high-valent iron-oxo which is capable of abstracting hydrogen atoms from strong C–H bonds. Some of the longest known and most widely used
Transition_metal_oxo_complex
Energy level of a quantum system
neighbouring Carbon atoms. Ammonia molecule, where the Nitrogen atom can be either above or below the plane defined by the three Hydrogen atoms. H+ 2 molecule
Degenerate_energy_levels
Atom of helium
the strong force. Unlike for the hydrogen atom, a closed-form solution to the Schrödinger equation for the helium atom has not been found. However, various
Helium_atom
Graphic representation of a molecular structure
connect. Additionally, Hydrogen atoms are implied and not usually drawn out. These can be inferred based on how many other atoms the carbon is attached
Structural_formula
Ion containing two or more atoms
polyatomic ion is the hydroxide ion, which consists of one oxygen atom and one hydrogen atom, jointly carrying a net charge of −1; its chemical formula is
Polyatomic_ion
hydrogen hydrogen bond A form of electrostatic interaction between an electronegative atom and a hydrogen atom bound to a second electronegative atom
Glossary_of_chemistry_terms
Parody where water is presented by an uncommon name
molecule is composed of two hydrogen atoms and one oxygen atom. Literally, the term "dihydrogen monoxide" means "two hydrogen, one oxygen": the prefix di-
Dihydrogen_monoxide_parody
Chemical group (=CH–)
It consists of a carbon atom bound by two single bonds and one double bond, where one of the single bonds is to a hydrogen. The group is also called
Methine_group
Chemical bond by sharing of electron pairs
"valence", as detailed in valence bond theory. In the molecule H 2, the hydrogen atoms share the two electrons via covalent bonding. The covalent character
Covalent_bond
English physicist (1887–1915)
experimental evidence in favour of Niels Bohr's theory, aside from the hydrogen atom spectrum which the Bohr theory was designed to reproduce. That theory
Henry_Moseley
Reduction in ductility of a metal exposed to hydrogen
ductility of a metal due to absorbed hydrogen. Hydrogen atoms are small and can permeate solid metals. Once absorbed, hydrogen lowers the stress required for
Hydrogen_embrittlement
Raising and lowering operators in quantum mechanics
2009-04-06. David, C. W. (1966). "Ladder Operator Solution for the Hydrogen Atom Electronic Energy Levels". American Journal of Physics. 34 (10): 984–985
Ladder_operator
Set of eigenvalues of a matrix
\mathbb {C} :\,|z|\leq 1\}} . The hydrogen atom provides an example of different types of the spectra. The hydrogen atom Hamiltonian operator H = − Δ − Z
Spectrum (functional analysis)
Spectrum_(functional_analysis)
Topics referred to by the same term
of hydrogen Hydrogen atom, about the physics of atomic hydrogen Hydrogen ion Hydron (chemistry), a.k.a. "proton" or "hydrogen" Isotopes of hydrogen Hydrogen-2
Hydrogen_(disambiguation)
Central atom with four substituents located at the corners of a tetrahedron
the tetravalent atom (e.g. carbon) at the cube centre which is the origin of coordinates, O. The four monovalent atoms (e.g. hydrogens) are at four corners
Tetrahedral molecular geometry
Tetrahedral_molecular_geometry
Atom set which has replaced hydrogen atoms on a hydrocarbon's parent chain
reference of comparison. Using a hydrocarbon as a reference, for each hydrogen atom that is replaced or "substituted" by something else, the molecule can
Substituent
Technology to create global images of otherwise invisible phenomena
provide another source of ENAs. The STEREO spacecraft detected neutral hydrogen atoms with energies in the 2–5 MeV range from the flare/CME SOL2006-12-05
Energetic_neutral_atom
All of space observable from the Earth at the present
assuming all atoms are hydrogen atoms (which are about 74% of all atoms in the Milky Way by mass), the estimated total number of atoms in the observable
Observable_universe
Quantum state of a system
needed] Atoms can be excited by heat, electricity, or light. The hydrogen atom provides a simple example of this concept. The ground state of the hydrogen atom
Excited_state
Chemical compound
chemical formula HAt, consisting of an astatine atom covalently bonded to a hydrogen atom. It thus is a hydrogen halide. This chemical compound can dissolve
Hydrogen_astatide
Organic reaction
(PMHS) as the hydrogen source. Both roles are combined in the trialkylboranes, which can abstract the required hydrogen atoms from protic solvents
Barton–McCombie_deoxygenation
Anion, salt, functional group or ester derived from a phosphoric acid
ester of orthophosphoric acid of the form PO4RR′R″ where one or more hydrogen atoms are replaced by organic groups. An example is trimethyl phosphate, (CH3)3PO4
Phosphate
Danish physicist (1885–1962)
with a postage stamp depicting Bohr, the hydrogen atom and the formula for the difference of any two hydrogen energy levels: h ν = ϵ 2 − ϵ 1 {\displaystyle
Niels_Bohr
Triatomic molecule
symmetry and bond angle of 104.5° between the central oxygen atom and the hydrogen atoms. Despite being one of the simplest triatomic molecules, its chemical
Chemical_bonding_of_water
Combining capacity of elements with other atoms
electrons for a given atom. The valence is the combining capacity of an atom of a given element, determined by the number of hydrogen atoms that it combines
Valence_(chemistry)
Notation for conserved quantities in physics and chemistry
states of the system. To fully specify the state of the electron in a hydrogen atom, four quantum numbers are needed. The traditional set of quantum numbers
Quantum_number
Rule for predicting outcomes of some addition reactions
carbon with the fewest hydrogen atoms while the hydrogen atom is added to the carbon with the greatest number of hydrogen atoms. The same is true when
Markovnikov's_rule
Chemical group derived from alkanes (one hydrogen removed)
In organic chemistry, an alkyl group is an alkane missing one hydrogen atom. The term alkyl is intentionally unspecific to include many possible substitutions
Alkyl_group
HYDROGEN ATOM
HYDROGEN ATOM
Boy/Male
Hindu
Atom
Boy/Male
Tamil
Small portion, Littleness, Practicle or atom
Girl/Female
Hindu
An atom
Girl/Female
Hindu
An atom
Boy/Male
Tamil
A sage who discovered atom
Boy/Male
Hindu
Small portion, Littleness, Practicle or atom
Boy/Male
Hindu
A sage who discovered atom
Girl/Female
Tamil
Pritikana | பà¯à®°à®¿à®¤à®¿à®•à®¾à®¨à®¾
Beloved, Dear one, An atom of Love
Pritikana | பà¯à®°à®¿à®¤à®¿à®•à®¾à®¨à®¾
Girl/Female
Indian
An atom culture
Girl/Female
Tamil
An atom
Girl/Female
Tamil
Anu Keerthi | அநà¯Â கிரதீ Â
Atom
Anu Keerthi | அநà¯Â கிரதீ Â
Girl/Female
Tamil
An atom
Boy/Male
Tamil
Atom of Love
Boy/Male
Hindu
Atom
Boy/Male
Tamil
Atom
Girl/Female
Tamil
Atom
Girl/Female
Indian
Atom
Girl/Female
Tamil
Preetika | பà¯à®°à®¿à®¤à¯€à®•à®¾Â
Beloved, Dear one, An atom of Love
Preetika | பà¯à®°à®¿à®¤à¯€à®•à®¾Â
Boy/Male
Hindu
An atom
Girl/Female
Tamil
Pritika | பà¯à®°à®¿à®¤à®¿à®•à®¾
Beloved, Dear one, An atom of Love
HYDROGEN ATOM
HYDROGEN ATOM
Biblical
remembering; of the male sex
Male
Greek
(ὙμÎναιος) Greek name HYMENAIOS means "bridal song" or "wedding song." In mythology, this is the name of a god of marriage.
Boy/Male
English Anglo Saxon
Bold warrior.
Girl/Female
Indian, Tamil
Goddess Amman
Girl/Female
African
Rejoicing.
Girl/Female
Muslim/Islamic
Beautiful
Boy/Male
Tamil
Protector
Boy/Male
American, Australian, British, English, German
From the Alder Tree; Birch Tree; Name of a Tree
Male
English
Variant spelling of English Jimmy, JIMI means "supplanter."
Girl/Female
Indian
Indian Goddess
HYDROGEN ATOM
HYDROGEN ATOM
HYDROGEN ATOM
HYDROGEN ATOM
HYDROGEN ATOM
n.
A compound radical, regarded as butane, less one atom of hydrogen.
n.
A gaseous element, colorless, tasteless, and odorless, the lightest known substance, being fourteen and a half times lighter than air (hence its use in filling balloons), and over eleven thousand times lighter than water. It is very abundant, being an ingredient of water and of many other substances, especially those of animal or vegetable origin. It may by produced in many ways, but is chiefly obtained by the action of acids (as sulphuric) on metals, as zinc, iron, etc. It is very inflammable, and is an ingredient of coal gas and water gas. It is standard of chemical equivalents or combining weights, and also of valence, being the typical monad. Symbol H. Atomic weight 1.
n.
A compound of two atoms of hydrogen with some other substance.
n.
A poison separable from decomposed meat infusions, and supposed to be formed from albuminous matter through the agency of bacteria.
a.
Pertaining to, or containing, hydrogen; as, hydric oxide.
n.
The act or process of freeing from hydrogen; also, the condition resulting from the removal of hydrogen.
v. t.
To combine with hydrogen; to treat with, or subject to the action of, hydrogen; to reduce; -- contrasted with oxidize.
a.
Having five hydrogen atoms capable of substitution.
a.
Composed of hydrogen and bromine; as, hydrobromic acid.
a.
Combined with hydrogen sulphide.
n.
Electricity.
n.
A binary compound of hydrogen; a hydride.
a.
Combined with or containing antimony; as, antimoniureted hydrogen.
n.
Carbureted hydrogen; also, a hydrocarbon.
a.
Formed by hydrogen and tellurium; as, hydrotelluric acid, or hydrogen telluride.
v. t.
To deprive of, or free from, hydrogen.
n.
A liquor consisting of honey diluted in water, and after fermentation called mead.
n.
Impregnating with sulphureted hydrogen gas.
a.
Of or pertaining to hydrogen; containing hydrogen.