Gas jar of Hydrogen.

Gas jar of Hydrogen.

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Credit: MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY

Caption: Gas jar of Hydrogen. Hydrogen is a colourless gas at room temperature. Its chemical symbol is H and is the most abundant chemical in the universe. As a chemical compound, a water molecule contains one oxygen and two hydrogen atoms that are connected by covalent bonds. At a concentration of 4-74%, hydrogen gas forms an explosive mixture with air.

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Keywords: 4-74%, atoms, chemical, chemical compound, chemical symbol, chemistry, colourless gas, concentration, covalent bonds, element, explosive mixture, gas, gas jar, h2o, hydrogen, no-one, nobody, oxygen, science, water molecule

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