Written by the Fiveable Content Team • Last updated August 2025
Verified for the 2026 exam
Verified for the 2026 exam•Written by the Fiveable Content Team • Last updated August 2025
Definition
H₂ represents hydrogen gas, which is composed of two hydrogen atoms bonded together. Hydrogen gas is colorless, odorless, and highly flammable. It is the lightest element and plays essential roles in various industrial processes.