hydrogen

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hydrogen

 (H) [hi´dro-jen]
a chemical element, atomic number 1, atomic weight 1.00797. (See Appendix 6.) It exists as the mass 1 isotope (protium, or light or ordinary hydrogen), mass 2 isotope (deuterium, heavy hydrogen), and mass 3 isotope (tritium).
hydrogen cyanide an extremely poisonous colorless liquid or gas, HCN, a decomposition product of various naturally occurring glycosides and a common cause of cyanide poisoning. Inhalation of the gas can cause death within a minute. Called also hydrocyanic acid.
heavy hydrogen deuterium.
hydrogen ion concentration the degree of concentration of hydrogen ions (the acid element) in a solution. Its symbol is pH, and it expresses the degree to which a solution is acidic or alkaline. The pH range extends from 0 to 14, pH 7 being neutral, a pH of less than 7 indicating acidity, and one above 7 indicating alkalinity. See also acid-base balance.
hydrogen peroxide H2O2, an antiseptic with a mildly antibacterial action. A 3 per cent solution foams on touching skin or mucous membrane and appears to have a mechanical cleansing action.
hydrogen sulfide H2S, a poisonous gas with an offensive smell, released from decaying organic material, natural gas, petroleum, and sulfur deposits, and sometimes used as a chemical reagent.

hy·dro·gen (H),

(hī'drō-jen),
1. A gaseous element, atomic no. 1, atomic wt. 1.00794.
2. The molecular form (H2) of the element. Synonym(s): dihydrogen
[hydro- + G. -gen, producing]

hydrogen

/hy·dro·gen/ (H) (hi´dro-jen) chemical element, at. no. 1; it exists as the mass 1 isotope (protium, light or ordinary h.), mass 2 isotope (deuterium, heavy h.), and mass 3 isotope (tritium) .
hydrogen cyanide  an extremely poisonous liquid or gas, HCN, used as a rodenticide and insecticide.
hydrogen peroxide  a strongly disinfectant cleansing and bleaching liquid, H2O2, used in dilute solution in water.
hydrogen sulfide  an ill-smelling, colorless, poisonous gas, H2S.

hydrogen (H)

[hī′drəjən]
Etymology: Gk, hydor + genein, to produce
a gaseous monovalent element. Its atomic number is 1; its atomic mass is 1.008. It is the simplest and the lightest of the elements and is a colorless, odorless, highly flammable diatomic gas. It occurs in pure form only sparsely in the earth and the atmosphere but is plentiful in the sun and in many other stars. Hydrogen is a component of numerous compounds, many of them produced by the body. As a component of water, hydrogen is crucial in the metabolic interaction of acids, bases, and salts within the body and in the fluid balance necessary for the body to survive.

hy·dro·gen

(H) (hī'drō-jen)
1. A gaseous element, atomic no. 1, atomic wt. 1.00794.
2. The molecular form of the element, H2.
Synonym(s): dihydrogen.
[hydro- + G. -gen, producing]

Hydrogen

The simplest, most common element known in the universe. It is composed of a single electron (negatively charged particle) circling a nucleus consisting of a single proton (positively charged particle). It is the nuclear proton of hydrogen that makes MRI possible by reacting resonantly to radio waves while aligned in a magnetic field.

hy·dro·gen

(hī'drō-jen)
1. Gaseous element, atomic no. 1, atomic wt. 1.00794.
2. Molecular form (H2) of the element.
[hydro- + G. -gen, producing]

hydrogen (H),

n a gaseous, univalent element. Its atomic number is 1 and its atomic weight is 1.008. It is the simplest and lightest of the elements and is normally a colorless, odorless, highly flammable diatonic gas.
hydrogen peroxide,
n an unstable compound of hydrogen and oxygen that is easily broken down into water and oxygen. A 3% solution is used as a mild antiseptic for the skin and mucous membranes; more concentrated solutions may be used as a whitening (bleaching) agent. May be used to reduce gingival inflammation, but may not eliminate the responsible bacteria.

hydrogen

a chemical element, atomic number 1, atomic weight 1.00797, symbol H. See Table 6. It exists as the mass 1 isotope (protium, or light or ordinary hydrogen), mass 2 isotope (deuterium, heavy hydrogen), and mass 3 isotope (tritium).

hydrogen bonding
weak electrostatic attraction between one electronegative atom and the hydrogen atom covalently linked to a second electronegative atom.
hydrogen breath test
detects hydrogen production as a product of bacterial fermentation of carbohydrates, an indicator of inflammatory bowel disease or carbohydrate malabsorption.
hydrogen cyanide
hydrocyanic acid.
heavy hydrogen
hydrogen having double the mass of ordinary hydrogen; deuterium.
hydrogen ion balance
hydrogen ion concentration
the degree of concentration of hydrogen ions (the acid element) in a solution. Its symbol is pH, and expresses the degree to which a solution is acidic or alkaline. The pH range extends from 0 to 14, pH 7 being neutral. A pH of less than 7 indicates acidity, above 7 indicates alkalinity. See also acid-base balance and ph.
hydrogen peroxide
H2O2, used in solution as an antibacterial agent. A 3% solution foams on touching skin or mucous membrane and appears to have a mechanical cleansing action.
hydrogen peroxide-based teat dips
hydrogen sulfide
an ill-smelling, colorless, poisonous gas, H2S; much used as a chemical reagent. Hydrogen sulfide is often present in gases from oil wells and from manure vats under slatted floor barns. Poisoning of cattle causes diarrhea, dehydration, dyspnea and death in convulsions. The feces are black and the breath smells of hydrogen sulfide. Called also hydrosulfuric acid. See also manure pit gas poisoning.
hydrogen swell
defective canned meat can. Can is distended due to production of hydrogen as a result of corrosion of the can surface.
References in periodicals archive ?
In this paper we present, apparently for the first time, an exact solution of the Santilli-Shillady restricted three-body model of the Hydrogen molecule along the lines of its originators and show that it does indeed represent correctly all basic data.
Caption: Hot hydrogen Collisions between hydrogen and nitrogen molecules in early Earth's atmosphere could have allowed hydrogen molecules to absorb a wider variety of light wavelengths ([H.
Unfortunately, most hydrogen molecules in space are too cold to give off any visible light.
The forward reaction rate will double once, due to the doubled concentration of nitrogen molecules and double three times over for each stage in which hydrogen molecules, also doubled in concentration, are involved in two-particle collisions.
The dark mater evolves with dark energy until glowing light matter of hydrogen molecules emerge.
Prof Lipscomb was awarded the Nobel for his studies on the structure and bonding mechanisms of compounds known as "boranes", a combination of boron and hydrogen molecules.
However, hydrogen molecules in their natural state are bonded to other elements, such as oxygen or carbon.
Instead, water and hydrogen molecules lie in traces in the rock and dust on moon's surface and move towards the poles
Hydrogen can also be procured through a complex chemical process wherein hydrogen molecules must be extracted from a compound like methane, which is found most commonly in natural gas.
35m robotic arm that can dig as deep as one metre to find ice and heat up samples to detect carbon and hydrogen molecules, essential elements of life.
As hydrogen molecules are so small they tend to leak out of everything, but our system will take 200 years to drain empty.
The peculiarly shaped hydrogen molecules in trans-fats are able to pass into human cells, where they cause degeneration leading to heart disease and cardial infarction.