hydrogen, H, atomic number 1(noun)
a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe
The lightest chemical element (symbol H) with an atomic number of 1 and atomic weight of 1.00794.
Molecular hydrogen (H), a colourless, odourless and flammable gas at room temperature.
An atom of the element.
A sample of the element.
Origin: From hydrogène, coined by Louis-Bernard Guyton de Morveau, from ὕδωρ + γεννάω.
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
Origin: [Hydro-, 1 + -gen: cf. F. hydrogne. So called because water is generated by its combustion. See Hydra.]
Hydrogen is a chemical element with chemical symbol H and atomic number 1. With an atomic weight of 1.00794 u, hydrogen is the lightest element and its monatomic form is the most abundant chemical substance, constituting roughly 75% of the Universe's baryonic mass. Non-remnant stars are mainly composed of hydrogen in its plasma state. At standard temperature and pressure, hydrogen is a colorless, odorless, tasteless, non-toxic, nonmetallic, highly combustible diatomic gas with the molecular formula H2. Most of the hydrogen on Earth is in molecules such as water and organic compounds because hydrogen readily forms covalent compounds with most non-metallic elements. Hydrogen plays a particularly important role in acid–base chemistry with many reactions exchanging protons between soluble molecules. In ionic compounds, it can take a negative charge, or as a positively charged species H+. The latter cation is written as though composed of a bare proton, but in reality, hydrogen cations in ionic compounds always occur as more complex species. The most common isotope of hydrogen is protium with a single proton and no neutrons. As the simplest atom known, the hydrogen atom has been of theoretical use. For example, as the only neutral atom with an analytic solution to the Schrödinger equation, the study of the energetics and bonding of the hydrogen atom played a key role in the development of quantum mechanics.
Chambers 20th Century Dictionary
hī′dro-jen, n. a gas which in combination with oxygen produces water, an elementary gaseous substance, the lightest of all known substances, and very inflammable.—adjs. Hy′dric, containing hydrogen; Hydrog′enous, containing hydrogen: produced by the action of water, as applied to rocks in opposition to those that are pyrogenous, formed by the action of fire. [A word coined by Cavendish (1766) from Gr. hydōr, water, and genēs, producing.]
U.S. National Library of Medicine
Hydrogen. The first chemical element in the periodic table. It has the atomic symbol H, atomic number 1, and atomic weight 1. It exists, under normal conditions, as a colorless, odorless, tasteless, diatomic gas. Hydrogen ions are PROTONS. Besides the common H1 isotope, hydrogen exists as the stable isotope DEUTERIUM and the unstable, radioactive isotope TRITIUM.
The Standard Electrical Dictionary
An element existing under all except the most extreme artificial conditions of pressure and cold as a gas. It is the lightest of known substances. Atomic weight, 1; molecular weight, 2; equivalent, 1; valency, 1; specific gravity, .0691-.0695. (Dumas & Boussingault.) It is a dielectric of about the same resistance as air. Its specific inductive capacity at atmospheric pressure is: .9997 (Baltzman) .9998 (Ayrton) Electro-chemical equivalent, .0105 milligram. The above is usually taken as correct. Other values are as follows: .010521 (Kohllrausch) .010415 (Mascart) The electro-chemical equivalent of any element is obtained by multiplying its equivalent by the electro-chemical equivalent of hydrogen. The value .0105 has been used throughout this book.
A chemical element with a known symbol, atomic number and atomic weight.
Hydrogen is used to create power and for various other purposes.
British National Corpus
Written Corpus Frequency
Rank popularity for the word 'hydrogen' in Written Corpus Frequency: #3805
Rank popularity for the word 'hydrogen' in Nouns Frequency: #2682
The numerical value of hydrogen in Chaldean Numerology is: 5
The numerical value of hydrogen in Pythagorean Numerology is: 6
Images & Illustrations of hydrogen
Translations for hydrogen
From our Multilingual Translation Dictionary
- hidrogenCatalan, Valencian
- ulai, hydrogenWelsh
- hydrogen, brintDanish
- Wasserstoff, Wasserstoffatom, Hydrogen, HydrogeniumGerman
- brint, vetni, hydrogen, loftevni, vatnevniFaroese
- wetterstofWestern Frisian
- haidreagainScottish Gaelic
- उदजन, हाइड्रोजनHindi
- idwojènHaitian Creole
- köneny, gyulany, hidrogénHungarian
- brintiKalaallisut, Greenlandic
- WaasserstoffLuxembourgish, Letzeburgesch
- waterstofLimburgish, Limburgan, Limburger
- vasstoff, vass-stoff, hydrogen, brenneNorwegian Nynorsk
- hydrogen, vasstoff, vass-stoff, vanntoffNorwegian
- háájiʼjinNavajo, Navaho
- донгуырOssetian, Ossetic
- ਉਦਜਨPanjabi, Punjabi
- yakuchaq, idruhinuQuechua
- vodik, vodonik, водик, водоникSerbo-Croatian
- ජලකරSinhala, Sinhalese
- sehlolametsiSouthern Sotho
- நீரகம், ஹைட்ரஜன்Tamil
- హైడ్రోజన్, ఉదజనిTelugu
- müvellidülma, hidrojenTurkish
- hyđrô, hiđrô, hy-đrô, hi-đrô, khinh khíVietnamese
- הידראגען, וואַסערשטאָףYiddish
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