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Hydrogen is a chemical element (atomic number 1). It is the most abundant element in the universe, comprising over 90% of all matter. In it's molecular state, it is a colorless, odorless gas.  It combines readily with oxygen and most other elements, but usually requires a heat source in order to form chemical compounds.

Hydrogen is a component of many organic molecules, most importantly water, but also fats and glucose.

Hydrogen at Wikipedia

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