Hydrogen is a chemical element with chemical symbol H and atomic number 1. With an atomic weight of 7000100794000000000♠1.00794 u, hydrogen is the lightest element on the periodic table. Its monatomic form (H) is the most abundant chemical substance in the universe, constituting roughly 75% of all baryonic mass. Non-remnant stars are mainly composed of hydrogen in its plasma state.
| Attributes | Values |
|---|---|
| rdfs:comment |
|
| rdfs:seeAlso | |
| foaf:depiction | |
| thumbnail | |
| is known for of | |
| is product of |