Hydrogen (disambiguation)

Look up hydrogen in Wiktionary, the free dictionary.

Hydrogen is the chemical element with symbol H and atomic number 1.

Hydrogen may also refer to:

• Dihydrogen, an allotrope of hydrogen
• Hydrogen atom, about the physics of atomic hydrogen
• Hydrogen ion
• Hydron (chemistry), a.k.a. "proton" or "hydrogen"
• Isotopes of hydrogen
  • Hydrogen-2 (deuterium)
  • Hydrogen-3 (tritium)
  • Hydrogen-4
  • Hydrogen-5