hydrogen is made up of Hydrogen is an element; it exists naturally as a molecule. Each hydrogen molecule is made up of two hydrogen atoms. In petrol and diesel cars, the burning of fuel produces carbon dioxide and water.
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Hydrogen is one of the chemical elements that exist in nature. An element has one type of atom, and it cannot be broken down into other substances. Hydrogen exists naturally as a molecule, consisting of two hydrogen atoms. The chemical formula of hydrogen is H₂.