🧪ap chemistry review

H₂

Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 examWritten by the Fiveable Content Team • Last updated September 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.