adj
Of, or using a mixture of, hydrogen and air.
n
(chemistry, historical) A hypothesized substance from which all other elements were formed.
n
(physics) A state of hydrogen that is poorly electrically conductive (much less conductive than metallic hydrogen).
n
(chemistry, historical) Oxygen gas, as originally thought to be air deprived of phlogiston (“the hypothetical fiery principle formerly assumed to be a necessary constituent of combustible bodies and to be given up by them in burning”).
adj
(chemistry) Describing a compound which has had some of its normal hydrogen (protium) replaced with the heavy isotope deuterium.
n
by restriction, semi-heavy water, deuterium-protium water (²H¹HO)
n
(physics) An isotope of hydrogen formed of one proton and one neutron in each atom - ²₁H.
n
(chemistry, American spelling) Water where both the hydrogen and oxygen atoms have been replaced by less common isotopes.
adj
(chemistry) Containing europium with valence three.
n
(chemistry) Water containing deuterium instead of normal hydrogen (protium) (symbol D₂O); used as a moderator in nuclear reactors.
n
Alternative form of heavy water [(chemistry) Water containing deuterium instead of normal hydrogen (protium) (symbol D₂O); used as a moderator in nuclear reactors.]
n
(chiefly attributive) Alternative form of heavy water [(chemistry) Water containing deuterium instead of normal hydrogen (protium) (symbol D₂O); used as a moderator in nuclear reactors.]
n
(inorganic chemistry) Ellipsis of helium hydride cation. The unstable binary cation HeH⁺ present in interstellar space. It is the strongest acid, reactive with every chemical species except positive ions, including electrons.
adj
(physics) Having the electronic structure of a helium atom
n
(chemistry, in combination) Seven atoms of magnesium in a chemical compound.
n
(chemistry) Any of a class of magnetic intermetallic compounds with face-centered cubic crystal structure and a composition of XYZ (half-Heuslers) or X2YZ (full-Heuslers), where X and Y are transition metals and Z is in the p-block. They have applications in spintronics.
n
A supposed form of hydrogen having a lower energy than that of the normal ground state; postulated to explain the outcome of early cold fusion experiments.
n
(dated, chemistry, physics) proton (positive hydrogen ion)
n
(obsolete, chemistry) An early term for hydrogen; hydrogen gas.
v
(chemistry) To bond to another species by means of hydrogen bonds. E.g. Water hydrogen bonds with itself.
n
A hypothetical future economy in which the primary form of stored energy for mobile applications and load balancing is hydrogen (H₂), and, in particular, hydrogen replaces fossil fuels in automobiles.
n
(chemistry, physics) an electrode in which hydrogen gas is adsorbed on platinum
n
(chemistry) Used other than figuratively or idiomatically: see hydrogen, ion. ; H⁻ or H⁺
adj
(physics, of an atom or molecule) Having a single electron.
adj
Alternative spelling of hydrogen-like [(physics, of an atom or molecule) Having a single electron.]
adv
(chemistry) In the presence of hydrogen.
n
(obsolete, rare) The negative pole or cathode.
n
(physics) An atomic nucleus, an isotope of hydrogen which contains one proton and at least one uncharged lambda hyperon.
adj
Alternative form of iodized [Treated with iodine or an iodide.]
n
Abbreviation of liquid hydrogen (a liquid composed of the liquid phase of molecular hydrogen (H₂))
n
(chemistry) Water in its standard form of H₂O, containing two protium hydrogen atoms, as opposed to heavy water.
n
(inorganic chemistry, physics) Any chemical element from the main group.
n
(medicine) Medicines made from mercury, generally used for purgative purposes from the 17th to the 19th century in European and American medicine.
adj
(not comparable, medicine) Caused by the action of mercury or a mercury compound.
n
a degenerate matter phase of hydrogen that is electrically conductive
n
(inorganic chemistry) The double decomposition of inorganic salts.
adj
(inorganic chemistry) Relating to molybdenum, especially describing compounds of molybdenum in which it has an oxidation state of +6.
n
(chemistry) monatomic hydrogen that exists transiently after the reduction of a hydrogen ion; generated from zinc and hydrochloric acid; it is a strong reducing agent
adj
(inorganic chemistry) Relating to trivalent neptunium
adj
(physics) Having the same electronic structure as a nitrogen atom
n
(physics, chemistry) Alternative name for the standard hydrogen electrode; an electrode with a standard electrode potential of zero; used as a standard against which other electrodes are measured.
adj
(physics) Having the same electronic structure as an oxygen atom
adj
Of, or using a mixture of, hydrogen and oxygen.
n
(physics) The form of the hydrogen molecule in which the two nuclei have antiparallel spin; about 25% of hydrogen at room temperature.
adj
Alternative form of percarburetted [(chemistry, obsolete) Combined with a relatively large amount of carbon.]
n
deuteration in which all (or all significant) hydrogen atoms are replaced with deuterium
n
(chemistry) Any of various compounds of transition metals or of rare earths that exhibit phosphorescence.
n
(medicine) Any platinum-based antineoplastic, of which class cisplatin is the archetypal member.
adj
(chemistry) Specifically, of compounds in which it has a higher valence as contrasted with plumbous compounds.
adj
(chemistry) Describing a compound that contains the normal isotope of hydrogen (rather than deuterium or tritium)
n
(physics, chemistry) The normal hydride ion using protium.
n
(chemistry) The graphical representation of the presence of protons (hydrogen ions) during a chemical reaction
adj
(chemistry) Containing atoms of four metals in each molecule.
n
(chemistry) Any radical that also carries an electric charge; typically, the charge and unpaired electron are associated with the same atom.
n
(physics, chemistry) Any atom which has a single valence electron in a shell well outside any other electrons in the aton; approximates the hydrogen atom.
n
(chemistry) any compound in which a metal atom is located between the faces of two planes of atoms, especially between two rings
n
(chemistry) DHO, a heavier form of water, containing a protium and a deuterium type of hydrogen atoms.
n
Alternative spelling of semi-heavy water [(chemistry) DHO, a heavier form of water, containing a protium and a deuterium type of hydrogen atoms.]
n
Used other than figuratively or idiomatically: see solid, hydrogen.
n
(chemistry) Water containing tritium instead of normal hydrogen (symbol T₂O).
n
Alternative form of super-heavy water [(chemistry) Water containing tritium instead of normal hydrogen (symbol T₂O).]
n
An alloy containing three metals or other elements
n
A hypothetical stable cluster of four neutrons.
n
(chemistry) A transition element
adj
(chemistry, of a molecule) Having nine atoms, groups of atoms, or ligands arranged around a central atom, defining the vertices of a triaugmented triangular prism.
n
A molecule composed of three helium atoms, or matter composed of such molecules. Symbol: He₃.
n
(crystallography) A compound crystal consisting of three individuals.
adj
(chemistry) Containing atoms of three metals in each molecule.
adj
(chemistry) Describing a compound which has had some of its normal hydrogen (protium) replaced with the heavy isotope tritium.
n
by restriction, THO, tritium-protium water (³H¹HO)
n
Alternative form of tritorium [(chemistry, obsolete) A vessel for separating liquids of different densities.]
n
(inorganic chemistry) The level of dissolved calcium salts in water
n
(chemistry, nonstandard, rare) Hydrogen.
n
(British spelling) an inorganic compound with the chemical formula ZnSO₄.
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