1) Atomic number 1 2) Chemical element 3) Chemical element 4) Element 5) Element discovered in 1776 6) Element in water 7) Element number 1 8) Element with the symbol H 9) First item on a certain table 10) French word used in English 11) Lightest element 12) Lightest known substance 13) Most abundant element
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https://www.crosswordclues.com/clue/hydrogen
1) Bomb 2) Gas 3) Tritium
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https://www.crosswordclues.com/clue/hydrogen
(H) H; protium. Element 1, atomic weight 1.00797. The most abundant element in the universe. Hydrogen occurs as H
2 at ambient temperature and pressure, a colorless, odorless, and extremely flammable gas. Discovered in 1766 by Cavendish.
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http://antoine.frostburg.edu/chem/senese/101/glossary/h.shtml
the simplest and lightest element; usually consists of just a single proton and electron; about 90 percent of the atoms in the universe are hydrogen.
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http://planetfacts.org/space-terms/
• (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 vegeta...
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http://thinkexist.com/dictionary/meaning/hydrogen/
a colourless, odourless, tasteless, flammable gaseous substance that is the simplest member of the family of chemical elements. The hydrogen atom has ... [102 related articles]
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http://www.britannica.com/eb/a-z/h/88
Hydrogen diffusion flame in the Natural Gas Combustion Apparatus. Credit: National Energy Technology Laboratory A colorless, highly flammable, gaseous element. Hydrogen is the first and lightest element in the periodic table. It was first recognized as a distinct substance by Henry Cavendish in ...
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http://www.daviddarling.info/encyclopedia/H/hydrogen.html
H The lightest gaseous element, and simplest of all atoms, occurring rarely in nature as a single atom, but common in the form of water, and in all organic compounds
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http://www.encyclo.co.uk/local/20722
Discovered : by Henry Cavendish in 1766Isolated in London, UKOrigin : The name is derived from the Greek ‘hydro genes`, meaning water forming.Description :A colourless, odourless gas that burns and can form an explosive mixture with air. It is currently manufactured from methane gas, but is also produced by the electrolysis of water and aqueo...
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http://www.encyclo.co.uk/local/20728
<chemistry, element> Hydrogen is a gas element which has an atomic number of 1 and an atomic weight of 1.0079. It combines with oxygen to form water (H20) and is present in all organic compounds. A few types of bacteria can metabolise atmospheric hydrogen (H2). Hydrogen gas itself is not poisonous, but when it mixes with air it can easily ign...
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http://www.encyclo.co.uk/local/20973
(H) (hi´dro-jәn) a chemical element, atomic number 1, atomic weight 1.00797. 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...
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http://www.encyclo.co.uk/local/21001
Hy'dro·gen noun [
Hydro- , 1 +
-gen : confer French
hydrogène . So called because water is generated by its combustion. See
Hydra .]
(Chemistry) A gaseous element, colorless, tasteless, and odorless, the lightest known substance, being fourteen and a half times ligh...
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http://www.encyclo.co.uk/webster/H/76
a gas.
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http://www.kidseclipse.com/pages/glossary.htm
(H) Type: Term Pronunciation: hī′drō-jen Definitions: 1. A gaseous element, atomic no. 1, atomic wt. 1.00794. 2. The molecular form (H
2) of the element. Synonyms: dihydrogen
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http://www.medilexicon.com/medicaldictionary.php?t=41929
Hydrogen is a non-metallic gaseous element with the symbol H. In its free gaseous state it is only found in nature in small quantities issuing from crevices in volcanic districts or near petroleum wells. It exists in combination everywhere; as a constituent of water, of all plants and animals, and in numerous minerals, abundantly in coal, petroleum...
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http://www.probertencyclopaedia.com/browse/GH.HTM
An element consisting of one electron and one proton. Hydrogen is the lightest of the elements and is the building block of the universe. Stars form from massive clouds of hydrogen gas.
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http://www.seasky.org/astronomy/astronomy-glossary.html
hydrogen 1. A colorless, odorless, flammable gas that combines chemically with oxygen to form water: the lightest of the known chemical elements. 2. A colorless, highly flammable gaseous element, the lightest of all gases and the most abundant element in the universe, used in the production of synthetic ammonia and methanol, in petroleum refining, ...
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http://www.wordinfo.info/words/index/info/view_unit/1009/6
gaseous element; the most abundant element in the universe; combines with oxygen to form water
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https://sciencetrek.org/sciencetrek/topics/astronauts/glossary.cfm
a gaseous element - very plentiful in the universe
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https://sciencetrek.org/sciencetrek/topics/water/glossary.cfm
An undesirable impurity if present in steel and a cause of fine hairline cracks especially in alloy steels. Modern vacuum treatment consists of pearlite and cementite.
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https://steelforge.com/literature/steelog-the-5000-word-metals-glossary/
Colourless, odourless, gaseous, non-metallic element, atomic number 1, relative atomic mass 1.00797. It is the lightest of all the elements and occurs on Earth, chiefly in combination with oxygen, as water. Hydrogen is the most abundant element in the universe, where it accounts for 93% of the total number of atoms and 76% of the total ...
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https://www.encyclo.co.uk/local/21221
A chemical element that can be used as a fuel since it has a very high energy content.
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https://www.encyclo.co.uk/local/22819
a colorless, odorless, flammable gas that combines chemically with oxygen to form water: the lightest of the known elements. Symbol: H; at. wt.: 1.00797; at. no.: 1; density: 0.0899 g/l at 0°C and 760 mm pressure.
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https://www.infoplease.com/dictionary/hydrogen
Hydrogen is an inert gas and the lightest, most abundant gas in the universe. It is believed it could be used as a substitute for helium in deep commercial and military diving.
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https://www.scubadoctor.com.au/scuba-diving-glossary.htm
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
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https://www.vocabulary.com/lists/724739
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