An Oxygen molecule has chemical formula O2 | Oxygen chemical formula O2.

The chemical formula O₂ represents Dioxygen (molecular oxygen), a colorless and odorless gas essential for respiration.

It consists of two oxygen atoms connected by a double bond and is the most stable and common form of elemental oxygen under standard conditions.

Oxygen makes up about 21% of Earth’s atmosphere and is vital for aerobic life. It is widely used in medicine, steelmaking, welding, water treatment, and as a rocket oxidizer.