Oxygen was discovered in 1774 by Joseph Priestley and Carl W. Scheele. Priestley discovered oxygen's ability to enhance combustion and biological role. Lavoisier confirmed air contains about 20% oxygen and established conservation law
Oxygen was discovered by Scheele in 1772 and Priestley in 1774. Earth's crust contains 46% oxygen, atmosphere 21%, seawater 89%. Oxygen exists as diatomic (O2) and triatomic (O3) forms
Oxygen was discovered by Scheele in 1772 and Priestley in 1774. Earth's crust contains 46% oxygen, atmosphere 21%, seawater 89%. Oxygen forms compounds with practically any element
O2 contains two oxygen atoms with a double bond. Each oxygen atom has two lone pairs
Oxygen was absent in Earth's atmosphere before photosynthesis. Small amounts of oxygen were released by geological and biological processes. Oxygen began accumulating in atmosphere at 1.85 Ga during Great Oxygenation Event
Oxygen is the most abundant element in Earth's crust (48.6%) and atmosphere (20.9%). Discovered by Priestley in 1774 and studied by Lavoisier. Second only to hydrogen and helium in universe by mass. Contains 89% of water quality and 20.9% of air volume