Hydrogen is the lightest element in the periodic table and is a colorless and odorless gas. It has the highest energy content of any common fuel and is used in a variety of industries, including petroleum refining, ammonia production, and food processing. Hydrogen is also used as a reducing agent in metallurgy and as a coolant in nuclear reactors.
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| Atomic number | 1 |
| Group | IA |
| Period | 1 |
| Mass | 1.00794 |
| Latin name | Hydrogenium |
| Electron configuration | 1s |
| Oxidation state | -1, 0, 1 |